3個tense-40分~急(明天要)

用present perfect,past tense present continuous tense , 時可以睇下有冇key words:
present perfect key words[has(he she it), have(I we you they)]:*already**since*
past tense(過去) key words: *yesterday*, *last friday*(星期一至日都ok,不過一定要有last)
present continuous tense(現在進行)key words : *look*
見到有key words 就知道用咩tense
E.G:
(present perfect)I have not heard(hear)from him since he left school.
(past tense)David visited(visit)Tokyo *last Monday*.
(present continuous tense)Look!The plane is landing(land).
(do,did...)Do you eat breakfast today? (Is,are...)Is there any bread?

2009-10-11 12:45:55 補充：
Is you eat breakfast? (錯)
如果知道佢已經食左就係:You ate your breakfast today.[past tense冇用do既過去式(did),動詞轉過去式(ate)
E.G: Did you eat your breakfast yesterday?[past tense用左did,動詞(eat)還原]

2009-10-11 12:46:47 補充：
verb to be= be變做 is[present tense(單數)] ,are[present tense(複數)], being(進行式),will be(過去式;可+not),was(is的過去式), were(are的過去式)
verb to do= do(present tense),did(past tense),done(present perfect&past perfect)
doing(present continuous tense),will do[future tense(+will/shall)]

verb to be=is,am,are
verb to do=做野
有唔明可以問