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He’s going to be fat. 他要發(fā)胖了。

There is going to be a storm. 要下暴風(fēng)雨了。

You’re going to break that chair. 你會把那把椅子弄壞的。

二、表示計劃或意圖

They are to be married. 他們打算結(jié)婚。

We are to be married in June. 我們計劃在6月結(jié)婚。

說明：該結(jié)構(gòu)也可用于條件狀語從句。如：

If I’m to be there on time, I must leave at once. 如果我要想準(zhǔn)時趕到那兒，我就必須馬上動身。

If we are to succeed in this enterprise, we shall need to plan everything very carefully. 如果我們想要在這項(xiàng)事業(yè)上取得成功，我們就需要把一切都仔細(xì)計劃好。

另外，若表示過去未曾實(shí)現(xiàn)的想法或意圖，其中的不定式則用完成式。如：

We were to have gone away last week, but I was ill. 我們本打算上周走的，但是我病了。

I was to have started work last week, but I changed my mind. 我本該上周開始工作的，但我改變了主意。

比較：

He was to go. 當(dāng)時他是要去的。(至于最后去沒去，不得而知)

He was to have gone. 他本來是要去的。(但實(shí)際上卻沒有去)

三、表示責(zé)任或義務(wù)

You are to report to the police. 你應(yīng)該報警。

I am to inform you that... 我有義務(wù)(我受人之托)通知你……

She is to be in class at 9 am. 她應(yīng)該上午9點(diǎn)到課堂。

四、表示命令或規(guī)定

You are not to smoke here. 此處禁止吸煙。

All staff is to wear uniforms. 全體工作人員必須穿制服。

Visitors are to leave when the bell rings. 來訪者必須在鈴響時離開。

You are to do your homework before you watch TV. 你得做完了作業(yè)才能看電視。

She can go to the party, but she’s not to be back late. 她可以去參加聚會，但不能晚回來。

No one is to leave this building without the permission of the police. 未經(jīng)警務(wù)人員允許，任何人不得擅自離開這座房子。

五、表示目的或用途

A knife is to cut with. 刀子是用來切東西的。

The telegram was to say that she'd be late. 電報是說她可能晚到。

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