英文grammar

六年級的學生通常錯tense( present and past tense )
since and for 用Past perfect tense 六年級有教
I have lived here since 1999
I have lived here for 8 years.

我估六年級的學生通常用錯'Past Continuous Tense', 'Future Continuous Tense', 'Present Perfect Tence'.
Since and for of 'Present Perfect Tence'

過去分詞(PP.)past participle

e.g. 原形 swim
過去式 swam
過去分詞 swum (PP.)
現在分詞 swimming (pp)

since同for通常係用present perfect tense

since
(常用於現在完成式或過去完成式)自...以來,從...至今
It's been ten years since they married.
他們結婚到現在已經十年了。
She has been living a hard life since her husband died.
自從丈夫死後,她一直過著艱苦的生活。
2. 既然;因為,由於
He must have taken the book since it isn't here.
他一定是把書拿走了,因為書已不在這裡了。
Since it is so hot, let's go swimming.
既然天氣這麼熱,我們去游泳吧。


for
因為,由於
We must start early, for it will take two hours to drive to the airport.
我們得早點動身,因為開車去機場得花兩個小時。

時式和串錯字

現在完成式(Present Perfect Tense)