be+不定式結(jié)構(gòu) 表示按計劃、安排即將發(fā)生的動作。例如：
There’s to be an investigation.
I am to have tea with Betty this afternoon.
這一結(jié)構(gòu)常見于報紙和廣播，用以宣布官方的計劃或決定。例如：
The Queen is to visit Japan next year.
二是表示命令、禁止或可能性等。例如：
You are to stand here. Do you understand?
Tell her she’s not to be back late.
一般現(xiàn)在時也可表達將來時間，常見于條件狀
語和時間狀語從句。例如：
If she comes, I’ll tell her all about it.
Wait here till the meeting is over.
It won’t be long before the rain stops.
近義詞辨析
begin, commence, initiate, launch, start
這組詞均含有“開始”的意思。
在這組詞中最常用，泛指開始做某事。但口語中近年來start用得較多。
The band began to play joyful music.樂隊開始演奏歡快的音樂。
commence比begin用法正式。在宗教或其它儀式及軍事用語中人們傾向用commence.
The officer ordered the soldiers to commence the attack.軍官命令士兵開始進攻。
initiate指進程中的第一步，與何時停止或結(jié)束沒有關(guān)系。
The government has initiated a new reform program.政府啟動了新的改革方案。
launch指開始或著手一項活動、計劃等大規(guī)?；蚵晞莺拼蟮男袆樱袆忧盎蛐袆又杏幸欢ǖ男麄鞴膭?。
The company will launch an advertising compaign to introduce its new product.那個公司要發(fā)起廣告攻勢推出自己的新產(chǎn)品。
Start與stop構(gòu)成反義用法，指從一特定地點出發(fā)，由靜止或等待狀態(tài)開始做某事。在口語中?？纱鎎egin。
They started operations at once.他們馬上開始行動。
全真模擬試題
1. ______ in the past, at the moment it is a favorite choice for wedding gown.
A. Unpopular has as white been
B. White has been as unpopular
C. Unpopular has been as white
D. Unpopular as white has been
2. ______ for a long time, the fields are all dried up.
A. There has been no rain
B. Having no rain
C. There having been no rain
D. There being no rain
3. The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A. had they been done
B. they had been done
C. having been done
D. they were done
4. Televisions enable us to see things happen almost at the exact moment ______.
A. which they are happening
B. they are happening
There’s to be an investigation.
I am to have tea with Betty this afternoon.
這一結(jié)構(gòu)常見于報紙和廣播，用以宣布官方的計劃或決定。例如：
The Queen is to visit Japan next year.
二是表示命令、禁止或可能性等。例如：
You are to stand here. Do you understand?
Tell her she’s not to be back late.
一般現(xiàn)在時也可表達將來時間，常見于條件狀
語和時間狀語從句。例如：
If she comes, I’ll tell her all about it.
Wait here till the meeting is over.
It won’t be long before the rain stops.
近義詞辨析
begin, commence, initiate, launch, start
這組詞均含有“開始”的意思。
在這組詞中最常用，泛指開始做某事。但口語中近年來start用得較多。
The band began to play joyful music.樂隊開始演奏歡快的音樂。
commence比begin用法正式。在宗教或其它儀式及軍事用語中人們傾向用commence.
The officer ordered the soldiers to commence the attack.軍官命令士兵開始進攻。
initiate指進程中的第一步，與何時停止或結(jié)束沒有關(guān)系。
The government has initiated a new reform program.政府啟動了新的改革方案。
launch指開始或著手一項活動、計劃等大規(guī)?；蚵晞莺拼蟮男袆樱袆忧盎蛐袆又杏幸欢ǖ男麄鞴膭?。
The company will launch an advertising compaign to introduce its new product.那個公司要發(fā)起廣告攻勢推出自己的新產(chǎn)品。
Start與stop構(gòu)成反義用法，指從一特定地點出發(fā)，由靜止或等待狀態(tài)開始做某事。在口語中?？纱鎎egin。
They started operations at once.他們馬上開始行動。
全真模擬試題
1. ______ in the past, at the moment it is a favorite choice for wedding gown.
A. Unpopular has as white been
B. White has been as unpopular
C. Unpopular has been as white
D. Unpopular as white has been
2. ______ for a long time, the fields are all dried up.
A. There has been no rain
B. Having no rain
C. There having been no rain
D. There being no rain
3. The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A. had they been done
B. they had been done
C. having been done
D. they were done
4. Televisions enable us to see things happen almost at the exact moment ______.
A. which they are happening
B. they are happening