it is over a year since i met him 为什么要用since since前不是要用完成时吗?

It is over a year since I last wrote to him.为什么前面不用完成时?It has been over a year . 以It is over a year now since Cthya came to china的阅读 Their core proposal is for a strategic initiative in IT research which would over a five-year period,see federal support increase by $1.37 billion a year. it is over a year since i met him 为什么要用since since前不是要用完成时吗? We have----(little) snowfall this year than year.The film Mickey is very----.Children all over the world are-----in seeing it.Look!Some-----(mouse) are eating rice over there.A tortoise has four leg,but it moves very----(slow) So the year is over It is a pleasure!zhong wen yi si? “it is over a year now since cathy came to china.she is now living in nanjing的完形填空 Studing abroad is quite different from life in china.it took her half a year to___________the langStuding abroad is quite different from life in china.it took her half a year to___________the language problem.A.turn over B.get over C.go over D.look o It is over to what is it over It says that a p____ has over 1000 d____ in a year is school all year round over there 是句型变换It's over a year since Cathy came to China能变几句是几句 there is time__enough.a.to think over it b.thinking over it c.to think it over d.thinking it over It is reported that the Hong Kong Disneyland is visited by over five million tourists every year. _____?It's seven A How old is Ben B What time is it C How much si it _____?It's seven A How old is Ben B What time is it C How much si it