初中时间状语从句语法及练习(全)状语从句是一个在复合句中修饰动词、形容词等的从句。
它可以从地点、时间、原因、目的、结果、条件、让步、比较、方式和伴随状况等方面修饰说明谓语。
状语从句的位置可以在句首，也可以在句末。
如果放在句首，从句后面常用逗号与主句隔开；放在句末时，从句前面往往不用逗号。
状语从句可以分为时间、地点、原因、目的、结果、让步、比较、方式和条件状语从句。
不同类型的状语从句有不同的从属连词和时态。
时间状语从句的从属连词有when、while、as、before、after、till/until、since、whenever、as soon as等。
时间状语从句中一般用一般现在时表将来（主将从现）。
When引导时间状语从句时表示“当……的时候”。
它可以指时间段也可指时间点，从句中既可用延续性动词又可用瞬间性动词，且动作既可和主句的动作同时发生又可在主句的动作之前或之后发生。
例如：“I will call you when I get there.”When XXX with "when"。
if the subject of the clause is the same as the subject of the main clause and the verb in the clause is "be"。
the subject and "be" can be omitted in the clause.For example。
"When (you are) in trouble。
ask her for help."If the subject of the time adverbial clause introduced by "when" is the same as the subject of the main clause。
the subject of the clause can also be omitted and replaced with the form "when + participle".For example。
"When I came into the room (= When coming into the room)。
I found XXX."When" can also be used to XXX when used in this way。
Alternatively。
the verb in the main clause can be a non-continuous verb if it emphasizes the n occurring during the process of the n in the clause。
The verb in the clause should always be a continuous verb。
and the clause is often in the progressive tense.For example。
"I met her while I was at school."While I was sleeping。
the UFO arrived."We were doing our homework while it was raining outside."Study while you study。
play while you play."As" XXX to express "when" (only for instantaneous verbs。
with two ns closely related。
one before and one after)。
"while" (emphasizing two ns happening at the same time。
including one XXX)。
or "along with" (one n changes with the change of another n。
and the clause can only be followed by continuous verbs).For example。
"XXX."As the wind rose the noise increased."C。
was going。
was occurringD。
was going。
occurred1) When I heard the steps。
I had just stepped out of the bathroom and was XXX2) XXX his ears。
XXX。
3) XXX4) As you're there。
can you get me some stamps。
5) I was going along the street looking for a place to park when the accident occurred。
解析。
1) 改写后更符合语法规则，使用when表示先后顺序。
2) 删除了明显有问题的段落，改写后更符合语法规则，使用when表示先后顺序。
3) 改写后更符合语法规则，使用when表示先后顺序。
4) 删除了明显有问题的段落，改写后更符合语法规则，使用as表示随着时间的推移。
5) 改写后更符合语法规则，使用went和occurred表示先后顺序。
他直到音乐会结束才出现。
2）用在句首，表示强调e.g。
Not until the XXX直到音乐会结束他才出现。
3）用在句中，表示部分否定e.g。
He didn’t leave until the concert ended。
but he didn’t stay until the party started。
他直到音乐会结束才离开，但他没有等到派对开始。
巩固练】I won’t leave ____ you come back.A。
XXXNot ____ she finished her homework did she watch TV.A。
XXX1）It is difficult for us to learn a lesson in life until we’XXX.改写：We can only learn a lesson in life after we’XXX.2）A good storyteller must be able to hold his listeners’ XXX the end of the story.改写：XXX。
one must be able to keep his listeners interested until the end of the story.3）I don’t really work here。
I am just helping out until the new secretary arrives.改写：I am XXX.4）Since引导的时间状语从句表示“自从……以来”，需注意以下两点：改写：Since is used to XXX point in the past。
It can be used with the present perfect tense in the main clause or with the past tense if referring to a specific point in the past.5）I have never seen him again since he left here.改写：Since he left here。
I XXX.6）They have been friends ever since they were in school.改写：They have been friends since their school days.7）It is two years since I XXX.改写：I have been a postgraduate student for two years.8）It was three years since we had been there.改写：XXX't been there for three years.I XXX。
It has been three years since I left there。
1) They have been friends since they met in Shanghai。
2) Wonderful。
It's been two years since I enjoyed myself so much。
XXX: "As soon as。
XXX。
directly。
instantly。
the moment。
the minute。
the instant。
XXX。
XXX。
and once"1) "As soon as" can be used to XXX future events using the present simple tense。
It can also be used to XXX or one after the other。
2) "XXX.than。
" and "hardly。
when。
" can only be used to describe past events。
In terms of tense。
the main clause uses the past perfect tense while the subordinate clause uses the simple past tense。
n is used with these phrases。
where the negative word is placed before the subject and the auxiliary verb comes before the subject。
For example: "I had hardly got home when it began to rain" can also be written as "Hardly had I got home when it beganto rain."One) Usage of "when," "while," and "as" to introduce time clauses:1."When" is most commonly used with the simple past tense in the subordinate clause。
