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　　A、構(gòu)成形式：

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　　(1)主語(yǔ)+be going to+動(dòng)詞原形+其他。

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　　(2)主語(yǔ)+will+動(dòng)詞原形+其他。

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　　B、判斷依據(jù)：

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　　一個(gè)句子中既有be動(dòng)詞，又有g(shù)oing、to和動(dòng)詞，且動(dòng)詞用的是原形，句中往往有tomorrow、soon、next week等詞。

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　　C、句型變換：

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　　She is going to have a picnic tomorrow.

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　　She isn’t going to have a picnic tomorrow.

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　　Is she going to have a picnic tomorrow?

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　　Yes, she is. / No, she isn’t.

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　　They are going to visit their grandparents next Sunday.

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　　They aren’t going to visit their grandparents next Sunday.

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　　Are they going to visit their grand parents next Sunday?

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　　Yes, they are. / No, they aren’t.

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　　三組將來(lái)時(shí)間表示法的用法比較

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　　一、 “will / shall+動(dòng)詞原形”與“be going to+動(dòng)詞原形”

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　　兩者均可表示將來(lái)時(shí)間和意圖，有時(shí)可以換用。如：I think it’ll rain this evening. / I think it’s going to rain this evening. 我想今晚會(huì)下雨。I won’t tell you about it. / I’m not going to tell you about it. 我不會(huì)把這事告訴你的。兩者的區(qū)別是：1. 若是強(qiáng)調(diào)某個(gè)意圖是經(jīng)過(guò)事先考慮好的，則通常要用be going to;若是表示某個(gè)意圖沒(méi)有經(jīng)過(guò)事先考慮，而是在說(shuō)話的當(dāng)時(shí)才臨時(shí)想到的，則通常用will。比較：—Ann is in hospital. 安住院了?！狾h, really? I didn’t know. I’ll go and visit her. 啊，真的嗎?我還不知道。我要去看看她。 (臨時(shí)想法，不能用be going to)—Ann is in hospital. 安住院了?！猋es, I know. I’m going to visit her tomorrow. 我知道，我打算明天去看看她。(事先考慮的意圖，不能用will)2. 若是有跡象表明要發(fā)生某事，通常只用be going to，不用will。如：Look at those black clouds. It’s going to rain. 看那些烏云，要下雨了。3. 帶有時(shí)間或條件狀語(yǔ)從句的主句通常不宜用be going to，而用will。如：When he comes back, I will tell him the news. 他回來(lái)時(shí)我就告訴他這個(gè)消息。If he comes back, I will tell him the news. 他若回來(lái)我就告訴他這個(gè)消息。

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　　二、“be going to+動(dòng)詞原形”與“現(xiàn)在進(jìn)行時(shí)”

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　　1. be going to主要表示主觀想法或意圖，而現(xiàn)在進(jìn)行時(shí)表示將來(lái)則主要強(qiáng)調(diào)已經(jīng)作出的安排。比較：I’m going to wash the car if I have time. 若有時(shí)間我想洗洗車。(主觀想法)I’m picking you up at 6; don’t forget. 我6點(diǎn)鐘來(lái)接你，不要忘了。6(已作出的安排)2. 但是當(dāng)要表示主觀無(wú)法控制的預(yù)測(cè)時(shí)，通常要用be going to，不能用現(xiàn)在進(jìn)行時(shí)態(tài)。如：It’s going to snow before long. 不久會(huì)下雪。Things are going to get better soon. 情況很快就會(huì)好起來(lái)。3. 當(dāng)表示堅(jiān)持要(不要)某人做某事時(shí)，兩者均可用。如：She’s taking [going to take] that medicine whether he likes it or not. 不管她喜歡不喜歡，她都得吃那藥。You’re not wearing [going to wear] that skirt to school. 你不可以穿那條裙子去上學(xué)。

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　　三、“be going to+動(dòng)詞原形”與“be to+動(dòng)詞原形

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　　be to+”兩者均可表示按計(jì)劃或安排要發(fā)生的動(dòng)作，有時(shí)可互換(但be to比be going to正式)。如：Where are we going to stay tonight? 我們今晚住哪里?I’m (going) to play tennis this afternoon. 我打算今天下午打網(wǎng)球。另外，be going to 還可表示預(yù)測(cè)，即根據(jù)已有跡象預(yù)測(cè)將要發(fā)生的動(dòng)作，此時(shí)不能用be to。如：Look, it’s going to rain. 看，要下雨了。