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Using because, since, as, so, therefore and similar expressions.
English expresses reason by explaining why something happens and result by explaining what follows from a situation.
Because, since, and as commonly introduce reason clauses, while so, therefore, thus, consequently, and as a result commonly express results.
Because introduces a subordinate clause that gives the reason for the situation in the main clause.
For example, We stayed home because it was raining.
Because of is a prepositional expression followed by a noun phrase, pronoun, or gerund rather than a finite clause.
For example, We stayed home because of the rain and He was late because of missing the bus.
Because introduces a clause, while because of introduces a noun phrase or gerund.
Compare We left because it was late with We left because of the late hour.
Since can introduce a reason when the reason is already known, obvious, or treated as background information.
For example, Since you are here, we can begin.
As can introduce a reason, often when the reason is background information rather than the main focus.
For example, As it was getting late, we decided to leave.
Because, since, and as can all introduce reasons, but they differ in emphasis, information status, and register.
Because is often the clearest choice for a direct reason, while since and as can present the reason as more backgrounded or obvious.
For can connect an independent clause that gives a reason or explanation, especially in formal or literary English.
For example, We left early, for the weather was deteriorating.
So can coordinate clauses when the second clause expresses the result of the first.
For example, It was raining, so we stayed home.
So + adjective or adverb + that introduces a result clause describing the consequence of a degree.
For example, It was so cold that we stayed inside.
Such + noun phrase + that can introduce a result clause based on the degree or nature of something.
For example, It was such a difficult problem that nobody could solve it.
Therefore introduces a result or logical conclusion based on preceding information.
For example, The evidence was incomplete; therefore, the researchers repeated the experiment.
Thus can introduce a result, consequence, or logical conclusion and is common in formal writing.
For example, The sample was too small; thus, the results were inconclusive.
Consequently introduces a formal consequence that follows from previously stated information.
For example, The company lost several clients. Consequently, it reduced its workforce.
As a result introduces a consequence caused by a previously mentioned situation.
For example, The roads were flooded. As a result, the school was closed.
Hence introduces a result or conclusion and is especially common in formal and technical writing.
For example, The data were incomplete; hence, no firm conclusion could be drawn.
So is a coordinating conjunction, while therefore is a sentence connector with different punctuation and syntactic behavior.
Compare It was late, so we left with It was late; therefore, we left.
Therefore can occur at the beginning, middle, or end of a clause, with punctuation depending on its position.
For example, Therefore, we left; We therefore left; and We left, therefore.
A reason clause can precede the main clause, and a comma is commonly used to separate the two clauses.
For example, Because it was raining, we stayed home.
A reason clause can follow the main clause without a comma when it is closely integrated with the main clause.
For example, We stayed home because it was raining.
A reason explains why an event happens, while a result describes what happens because of it.
For example, Because it rained, we stayed home expresses reason, while It rained, so we stayed home expresses result.
Due to is a prepositional expression that introduces a noun phrase and is common in formal English.
For example, The flight was delayed due to bad weather.
Owing to introduces a noun phrase expressing a reason or cause and is generally more formal.
For example, The event was cancelled owing to heavy rain.
Due to normally precedes a noun phrase, while because introduces a finite clause.
Compare The match was cancelled because it was raining with The match was cancelled due to the rain.
Due to and owing to have similar meanings, although owing to is more strongly associated with formal written style.
Both can introduce a noun phrase giving the reason for an event.
Therefore does not normally introduce a subordinate finite clause in the same way as because.
For example, Therefore, we left is possible, while Therefore we were tired is not an ordinary equivalent of Because we were tired.
So can introduce a result clause after an expression of degree or consequence as well as coordinate independent clauses.
For example, It was so expensive that we could not afford it and It was expensive, so we chose another one.
So and such can express degree that produces a consequence.
For example, She was so tired that she fell asleep and It was such a long meeting that everyone became exhausted.
Reason and result expressions vary in register, with because and so common in everyday language and therefore, consequently, hence, and owing to more common in formal writing.
Choose the expression according to the context rather than assuming that formal expressions are always more correct.
Use reason and result expressions according to their grammatical pattern and logical direction.
Common mistakes include confusing because with because of, using therefore as a conjunction, confusing reason with result, using due to before a finite clause, and mixing so ... that with so as a coordinating conjunction.