We can use half or half of before a noun with a determiner (e.g. the, my, this, your etc.). When half (of) is followed by a plural noun, the verb is plural.
- She spends half (of) her time travelling.
- Half (of) my friends live abroad.
We use half of before pronouns.
- ‘Did you like the books?’ ‘I have only read half of them.’ (NOT --- half them.)
We use the half (of) to talk about a particular half.
- I think the second half of the film is more interesting than the first half.
half a and a half
Half usually comes before the article a/an, but it is possible to put it after in expressions of measurement.
- I have bought half a pound of apples. (OR I have bought a half pound of apples.)
...hardly ...when/before ...
Have or have got
Have vs Having
Hear and listen
He, she or they
How and what like?
However, yet, still, though
How ever and however
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