已经决定好的计划，用 am/is/are going to。going to 后面用动词原形。（I'm = I am。）
I'm going to study
I'm going to study tonight.
I'm going to call Amina later.
We're going to eat at the cafe on Moffen Street.
试一试: ___ study tonight. (I'm going to / I going to / I'm go to) 答案: I'm going to — going to 前面需要 am：I'm going to study。（I'm = I am。）别漏掉 am，也别改动 "going to"。
am、is 还是 are？
I 用 am，he / she / it 用 is，you / we / they 用 are。
I'm going to help.
Hiroshi is going to visit Senfarren.
They are going to stay.
Not "He are going to come." — say "He is going to come.". he、she、it 用 is，不是 are。
试一试: Hiroshi ___ visit Senfarren. (is going to / are going to / going to) 答案: is going to — Hiroshi 是一个人（he），所以用 is：is going to visit。（"are" 是给 you、we、they 用的。）
动词保持原形
going to 后面动词要保持原形，不加 -s，不加 -ing。
She is going to study.
He is going to come at six.
They are going to play in the park.
Not "He is going to studies." — say "He is going to study.". going to 后面用动词原形：study，不是 studies。
试一试: She is ___ tonight. (going to study / going to studies / going to studying) 答案: going to study — going to 后面动词保持原形：study。不是 "studies"，也不是 "studying"。
别漏掉 'to'
别忘了那个小小的词 to：I'm going to study。别漏掉它。
I'm going to visit Amina.
We're going to eat soon.
He's going to play later.
试一试: I'm ___ Amina on Saturday. (going to visit / going visit) 答案: going to visit — 记得那个小小的词 to：going to visit。别漏掉它（"going visit" 就是少了 to）。
isn't / aren't going to
表示计划不会发生，在 am/is/are 后面加 not。（isn't = is not；aren't = are not。）
He isn't going to come.
We aren't going to stay.
He is not going to come. = He isn't going to come.
试一试: He ___ come tonight. (isn't going to / not going to / doesn't going to) 答案: isn't going to — is 后面加 not：isn't going to come。（isn't = is not。）going to 不能和 "doesn't" 一起用。
提问
提问时把 Am / Is / Are 放最前面：Are you going to...? Is he going to...?
Are you going to study?
Is he going to come?
What are you going to do?
试一试: ___ study this weekend? (Are you going to / You are going to / Do you going to) 答案: Are you going to — 提问时 Are 放最前面：Are you going to study? "You are going to" 是陈述句，不是提问，也不用加 "do"。
试一试: They ___ play in the park. (are going to / is going to / going to) 答案: are going to — "They" 搭配 are：are going to play。保留 "going to" 和动词原形。