during
表示在.期間,沒有時態(tài)限制,可能是現(xiàn)在,可能是過去.
throughout the course or duration of (a period of time) :the e.g.restaurant is open during the day.
the period during which he grew to adulthood.
over
這個意思就多了,甚麼超過啊,路過啊.
be over 表示不在受甚麼東西影響了.e.g.we were over the least.
over and over就表示一遍一遍的
反正over就有超過,覆蓋的意思,更加沒有時態(tài)限制.
since
意思：“自從...起”.一般用現(xiàn)在完成時態(tài)
表示“因為”意思時候,沒有時態(tài)限制
long since做副詞時候也不需要用完成時態(tài).
preposition,conjunction,& adverb
1 in the intervening period between (the time mentioned) and the time under consideration,typically the present :[as prep.] she has suffered from cystic fibrosis since 1984 | the worst property slump since the war | [as conj.] I've felt better since I've been here | [as adv.] she ran away on Friday and we haven't seen her since.
2 [ conj.] for the reason that:because :delegates were delighted,since better protection of rhino reserves will help protect other rare species.
3 [ adv.] ago :the settlement had vanished long since.
for
指一段時間的長度.
我已經(jīng)13年沒有見她了.
I have not seen her for 13 years
I have not seen her since 1995.
indicating the length of (a period of time) :he was in prison for 12 years