九年級英語Unit3
1.語態(tài)：
①英語有兩種語態(tài)：主動語態(tài)和補(bǔ)動語態(tài)
主動語態(tài)表示是動作的執(zhí)行者
被動語態(tài)表示主語是動作的承受者
cats eat fish. （主動語態(tài)）貓吃魚。
fish is eaten by cats. (被動語態(tài))魚被貓吃。
②被動語態(tài)的構(gòu)成
由“助動詞be ＋及物動詞的過去分詞”構(gòu)成
助動詞be 有人稱、數(shù)和時(shí)態(tài)的變化，其變化規(guī)則與be 作為連系動詞時(shí)完全一樣。
時(shí)態(tài) 被動語態(tài)結(jié)構(gòu) 例句
一般現(xiàn)在 時(shí) am
are +過去分詞
is english is spoken in many countries.
一般過去 時(shí) was +過去分詞
were + 過去分詞 this bridge was built in 1989.
情 態(tài)
動 詞 can/should
may +be+過去分詞
must/…… the work must be done right now.
③被動語態(tài)的用法
當(dāng)我們不知道誰是動作的執(zhí)行者，或者沒有必要指出誰是動作的執(zhí)行者，或者只需強(qiáng)調(diào)動作的承受者時(shí)，要用被動語態(tài)。
2. allow sb. to do sth. 允許某人做某事（主動語態(tài)）如：
mother allows me to watch tv every night. 媽媽允許我每晚看電視。
be allowed to do sth. 被允許做某事（被動語態(tài)）如：
lily is allowed to go to qinzhou. 莉莉被允許去欽州。
3. get their ears pierced 穿耳洞
讓/使（別人）做某事 get sth. done(過去分詞)
have sth. done 如：
i get my car made. == i have my car made. 我讓別人修好我的車
4. enough 足夠
形容詞＋enough 如：beautiful enough 足夠漂亮
enough＋名詞 如：enough food 足夠食物
enough to 足夠…去做… 如：
i have enough money to go to beijing. 我有足夠的錢去北京。
she is old enough to go to school.她夠大去讀書了。
5. stop doing sth. 停止做某事 please stop speaking.請停止說話。
stop to do sth. 停止下來去做某事 please stop to speak.
請停下來說話。
6. 看起來好像…sb. seem to do sth.
it seems that +從句
he seems to feel very sad.
it seems that he feels very sad. 他看起來好像很傷心。
7. 系動詞不能獨(dú)立作謂語，要和表語一起構(gòu)成謂語。常用的連系動詞有：look, feel, be, become, get, turn, smell, taste, stay(保持), kept等。連系動詞除be 和become 等少數(shù)詞可接名詞作表語外，一般都是接形容詞。 如：
they are very happy. he became a doctor two years ago.
she felt very tired.
8. 倒裝句:
由so＋助動詞(be/do/will/have)/情態(tài)動詞＋主語 意為：…也是一樣
she is a student. so am i. 她是一個(gè)學(xué)生，我也是。