Adverbs of time tell us when an action happened, but also for how long, and how often. Adverbs of time are invariable. They are extremely common in English. Adverbs of time have standard positions in a sentence depending on what the adverb of time is telling us.
ADVERBS THAT TELL US WHEN
Adverbs that tell us when are usually placed at the end of the sentence.
Putting an adverb that tells us when at the end of a sentence is a neutral position, but these adverbs can be put in other positions to give a different emphasis. All adverbs that tell us when can be placed at the beginning of the sentence to emphasize the time element. Some can also be put before the main verb in formal writing, while others cannot occupy that position.
ADVERBS THAT TELL US FOR HOW LONG
Adverbs that tell us for how long are also usually placed at the end of the sentence.
In these adverbial phrases that tell us for how long, for is always followed by an expression of duration, while since is always followed by an expression of a point in time.
ADVERBS THAT TELL US HOW OFTEN
Adverbs that tell us how often express the frequency of an action. They are usually placed before the main verb but after auxiliary verbs (such as be, have, may, & must). The only exception is when the main verb is “to be”, in which case the adverb goes after the main verb.
Many adverbs that express frequency can also be placed at either the beginning or the end of the sentence, although some cannot be. When they are placed in these alternate positions, the meaning of the adverb is much stronger.
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