作业帮关于现代完成时
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/11/07 16:38:52
He was born 15 years ago（改为同意句） He is______ _______ _______this year 刚讲的现代完成时，不太熟练
解题思路： 见解答
解题过程：
答案： He is 15___ years___ _old__this year.
现在完成时
现在完成时的结构： 主语 + “have(has) + 过去分词”
规则变化的过去分词与过去式的变化一样，在动词词尾加ed; 不规则变化的过去分词见不规则动词表，需要记忆。
现以see the film为例将现在完成时的肯定句， 否定句和疑问句列表如下：
肯定句：I/You/We/They have seen the film. He/She /It has seen the film.
否定句：I/You/We/They have not/ haven’t seen the film.
He/ She/It has not/hasn’t seen the film.
疑问句：Have I/you/they seen the film? Yes, you/ we/I/they have. No, you/ we/I/they haven’t.
Has he/she/it seen the film? Yes, he/ she/ it has. No, he/ she/ it hasn’t.
（1）现在完成时用来示意对当前状况仍有影响的，刚刚完成的动作（常与yet，already，just，so for ,ever,never等连用），或者过去某一时刻发生的，持续到现在的情况（常与for，since连用）。比方：
1）I have just finished my homework.
2）Mary has been ill for three days.
留心：与for ,since 连用的动词必须用延续性动词，而不能 用短暂性动词如：come —be here go ——be there join—— be a member borrow ——keep leave ——be away 等等
（2）常与现在完成时连用的时间状语有：since, for, during等引导出的短语；副词already, yet, just, ever, now, before, often, lately, recently等；状语词组 in the past ten years ，so far, up to now, many times, up to the present等。比方：
1）I haven’t been there for five years.
2）So far, she hasn’t enjoyed the summer vacation.
3）There have been a lot of changes since 1978.
最终答案：略
解题过程：
答案： He is 15___ years___ _old__this year.
现在完成时
现在完成时的结构： 主语 + “have(has) + 过去分词”
规则变化的过去分词与过去式的变化一样，在动词词尾加ed; 不规则变化的过去分词见不规则动词表，需要记忆。
现以see the film为例将现在完成时的肯定句， 否定句和疑问句列表如下：
肯定句：I/You/We/They have seen the film. He/She /It has seen the film.
否定句：I/You/We/They have not/ haven’t seen the film.
He/ She/It has not/hasn’t seen the film.
疑问句：Have I/you/they seen the film? Yes, you/ we/I/they have. No, you/ we/I/they haven’t.
Has he/she/it seen the film? Yes, he/ she/ it has. No, he/ she/ it hasn’t.
（1）现在完成时用来示意对当前状况仍有影响的，刚刚完成的动作（常与yet，already，just，so for ,ever,never等连用），或者过去某一时刻发生的，持续到现在的情况（常与for，since连用）。比方：
1）I have just finished my homework.
2）Mary has been ill for three days.
留心：与for ,since 连用的动词必须用延续性动词，而不能 用短暂性动词如：come —be here go ——be there join—— be a member borrow ——keep leave ——be away 等等
（2）常与现在完成时连用的时间状语有：since, for, during等引导出的短语；副词already, yet, just, ever, now, before, often, lately, recently等；状语词组 in the past ten years ，so far, up to now, many times, up to the present等。比方：
1）I haven’t been there for five years.
2）So far, she hasn’t enjoyed the summer vacation.
3）There have been a lot of changes since 1978.
最终答案：略