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Sometimes or sometime?

from English Grammar Today

Sometimes means ‘not always or not often’:

We usually played football at school, but sometimes we played hockey.

I sometimes wonder whether I should give up my job and just travel.

Sometime means ‘at an unknown or undecided time in the future or the past’:

Why don’t you come over and have dinner with us sometime? (at an undecided time in the future)

I knew I had met her sometime, but I couldn’t remember when.

(“Sometimes or sometime ?” from English Grammar Today © Cambridge University Press. Need grammar practice? Try English Grammar Today with Workbook.)
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