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during over since for的用法和时态

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during over since for的用法和时态
during over since for的用法和时态
during
表示在.期间,没有时态限制,可能是现在,可能是过去.
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
这个意思就多了,甚麼超过啊,路过啊.
be over 表示不在受甚麼东西影响了.e.g.we were over the least.
over and over就表示一遍一遍的
反正over就有超过,覆盖的意思,更加没有时态限制.
since
意思:“自从...起”.一般用现在完成时态
表示“因为”意思时候,没有时态限制
long since做副词时候也不需要用完成时态.
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
指一段时间的长度.
我已经13年没有见她了.
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