你已经学过 will 和 going to 都能表示将来。如果是说话之前就已经决定好的计划，用 going to。
早就定好的计划：going to
I 'm going to visit my parents this weekend. (I planned it.)
She 's going to start a new job. (She already signed the contract.)
We 're going to have a party on Saturday. (We organised it.)
试一试: Amina 上周就买好了机票。她去 Senfarren 的行程全都安排妥了。 哪个更符合她早就定好的计划？ (She 's going to fly to Senfarren. / She 'll fly to Senfarren.) 答案: She 's going to fly to Senfarren. — 她说话之前就已经决定并安排好了（机票都买了），所以用 going to：She's going to fly. "She'll fly" 听起来像是她这一刻才决定的，但她其实上周就计划好了。
能看出来即将发生的事：going to
当你能从眼前的情况当下就看出事情要发生了，用 going to。
Look at those clouds! It 's going to rain.
Watch out, that glass 's going to fall!
The bus is full. We 're going to have to wait.
试一试: Hiroshi 抬头看着灰暗的天空。云越来越厚，风也越刮越大。 哪个更符合他能看出来的情况？ (It 's going to rain. / It 'll rain.) 答案: It 's going to rain. — 证据就摆在眼前（阴沉的天空、越来越厚的云层），所以英语用 going to：It's going to rain. 而 "It'll rain" 一般留给基于看法或猜测的预测，而不是眼前正在酝酿的迹象。
当场决定：will
will（'ll）用来表示你这一刻当场做出的选择，之前完全没有计划。也用于提议和承诺。
The phone is ringing. I 'll answer it.
That sounds fun. I 'll join you!
Those bags look heavy. I 'll help you.
试一试: Mei 看到 Lars 提着很重的袋子，当场就决定去帮他。 哪个更符合她当场的决定？ (I 'll help you. / I 'm going to help you.) 答案: I 'll help you. — 她是当场决定的，之前没有计划，所以用 will：I'll help you. "I'm going to help" 听起来像是她早就计划好的，但她其实是刚刚才决定。
两种形式怎么构成
就两个简单的结构。will：will + 动词原形（I will go，she will help）。going to：am/is/are + going to + 动词原形（I 'm going to go，she 's going to help）。动词原形永远不变，am/is/are 要跟人称对应。
will + base: They will call you tonight. · I will finish it soon.
be + going to + base: I 'm going to cook dinner. · He 's going to study tonight. · We 're going to leave early.
Match the person: I am, he/she/it is, you/we/they are going to...
Not "I going to cook dinner." — say "I 'm going to cook dinner.". going to 前面永远要有 be（am/is/are）——不要漏掉。
试一试: Marta planned this earlier: cook dinner tonight. 把 Marta 的计划组建出来。把单词排好顺序。 答案: Marta is going to cook dinner tonight. — 结构是 be + going to + 动词原形：Marta is going to cook dinner tonight。动词保持原形 cook。两种将来形式绝不能混在一起——"will going to" 不是一个正确的形式。
说事情不会发生
要变成否定：will → won't（will not）。going to 的否定，是把 not 放在 am/is/are 后面：'m not / isn't / aren't going to。
won't: I won't be late. · They won't come tonight.
be + not + going to: I 'm not going to buy it. · He isn't going to call. · We aren't going to wait.
Watch out: not goes after am/is/are, not after going: isn't going to (not "is going to not").
试一试: The clouds are gone and the sun is out. It ___ rain now. (isn't going to / isn't going / is going to not) 答案: isn't going to — 眼前的迹象变了，所以还是用 going to，否定就把 not 放在 is 后面：it isn't going to rain。going to 要完整保留（不能只说 "going"），而且 not 要放在 going 前面（不是 "is going to not"）。
问将来的事
提问时把助动词放在最前面。will：Will + you + 动词原形?going to：Am/Is/Are + you + going to + 动词原形?
Will you help me? — Yes, I will. / No, I won't.
Are you going to watch the game? — Yes, I am. / No, I'm not.
Is she going to come? · Will it rain tomorrow?
试一试: ___ you going to visit Senfarren this summer? (Are / Will / Do) 答案: Are — going to 的疑问句要用 am/is/are 开头：Are you going to visit...? "Will" 只能直接跟动词原形，不带 going to（Will you visit...?）。"Do" 不用来表示这种将来。
Planned before now: We 're going to move house in May.
See it coming now: You 're going to drop that plate!
Deciding this second: OK, I 'll get the door.
试一试: Sofia 上个月就定好了计划：她报了一个六月开课的烹饪班。 Sofia 闻到厨房里有烟味，立刻决定去看看烤箱。 把每一句配对起来。哪种将来时符合哪个时刻？ 答案: Sofia 上个月就定好了计划：她报了一个六月开课的烹饪班。 → 1 → She 's going to take a cooking course. · 2 → She 'll check the oven. Sofia 闻到厨房里有烟味，立刻决定去看看烤箱。 → 1 → She 'll take a cooking course. · 2 → She 's going to check the oven. — 上个月定好的计划 → going to（she's going to take the course）。当场做的决定 → will（she'll check the oven）。前者是提前安排好的，后者是当场决定的。