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a few year’s time a few years’ time B. a few year’s times a few years’ times
year’s, be covered with years’, be covered year’s, cover with years’, be covered with
during which of which since when in that
one and a half years’ a year and half one and a half year’s a year and half’s
g（q）+r（q）=gr（s） 2g（s）+r2=2gr（s） g（s）+1/2r2（l）=gr（s） g（s）+1/2r2（S）=gr（s）
will complete; complete will be completed; is completed will be completed; will be completed is completed; will be completed
have pulled be pulling have been pulled be pulled
during which of which since when in that
when; then not until; that not; until only; when
two day’s；two day’s time；15-year-old two-day；two day’s time；15 years old two-day；two days’ time；15-year-old two days；two-day time；15-years-old
since; before before; since since when when; before
will rain is raining will be raining would rain
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