高中英語語法教案名詞
while只指一段時間,從句中的謂語動詞不能用終止性動詞,強調某一段時間內主從句動作同時發生,常對同類的動作進行對比。如:while we were waiting for a bus, it was raining hearily.(我們在等車時,天正下著大雨。) 2)till和until till和until都表示“直到…為止”。主句用延續性動詞,主句和從句都用肯定式:意為“直到…才”。主句用終止性動詞,從句用肯定式,主句用否定式。until較till正式,until引導的時間從句可以放在句首。 例如: she won't go away till you promise to help her. 直到你允諾要幫助她,她才走開。 until you told me, i had heard of nothing what happened. 直到你告訴我,我才知道發生了什么事。 3)since since引導的時間狀語從句常用一般過去時,其主句一般使用現在完成時。 例如:jim has been in the factory for two years since he left school. 從吉姆畢業起,他在這家工廠工作兩年了。 (二)狀語從句 修飾主句中的謂語動詞,形容詞或副詞等的從句叫狀語從句。 例如: he didn't go to school yesterday because he was ill.(修飾動詞go) 昨天他沒去上學,因為他病了。 we must study so well as our teacher hoped.(修飾副詞well) 我們應該學得你我們老師希望的那么好。 lucy is younger than jim(is)。(修飾形容詞younger) 露茜比吉姆年輕。 狀語從句的語序應是主語+謂語+其他成分,即陳述句的語序。 狀語從句的位置,可以放在主句前面或后面,但是若放在主句前面,要用逗號與主句分開;主句若是疑問句,那么時間狀語從句只能放在主句的前面。 1)時間狀語從句 時間狀語從句由when, while, after, before, since, as soon as, till, until等連詞引導。 例如: i went to bed after the tv play was ever. 電視劇完了以后我上床睡覺。 could you look after her while we're away? 我們不在時你能照顧她嗎? she has taught in this school since she came to this city in 1989. 自從一九八九年她來到這座城市以來一直在這所學校教書。 wait until i come back. 請你等到我回來。 注意: 如主句是一般將來時,則表示將來的時間狀語只用一般現在時。 例如: i'll write to you as soon as i get to beijing. 我一到北京就將寫信給你。 it will get warmer and warmer when spring comes. 春天來臨時,天氣將變得越來越暖和。 2)原因狀語從句 原因狀語從句由because, as, since等連詞引導。 例如: he sold the car because it was too small. 他賣掉那輛小汽車,因為它太小了。 since you won't help me, i must do the job myself. 你既然不幫我忙,我必須自己做這項工作。 as my mother is away at this moment, i have to look after my younger sister. 由于我的媽媽現在不在,我不得不照顧我的妹妹。
注意: a)because, as, since, for的用法辨析 because, as, since, for都是表示各種理由的連詞,但because多表示所敘述的理由是本句的重點,故because所引導的從句常放在句末。 例如: why was he absent? because he was badly ill.