一般将来时be going to的用法，“Be going to” 构造和现在进行时都能够用于讨论将来的方案和分配，但在应用时要留意他们的差别：“be going to” 只有指一个大概的分配、准备，而现在进行时能够突显将来的方案早已明确，关键点已定。
1. 句法结构
1) Be going to 构造
Be going to is followed by a bare infinitive verb - a verb with no 'to'. Don't forget to change the 'be' verb to the correct form to agree with the subject pronoun!
“Be going to” 后接动词原形。留意：系动词 “be” 的方式应该和主语一致。
I am going to eat something.
She's going to be very angry.
They're going to be late, I think.
2) 现在进行时
The present continuous tense is formed using the auxiliary verb be (verb)ing. Be careful of state verbs, such as 'know' and 'need', which are only rarely used in the continuous form.
现在进行时的基础构造是：be 形容词-ing。留意：相近 “know（了解）”、“need（*须）” 等情况形容词不用以开展语态。
I'm working! What do you want?
He's playing football later.
We're having a party. Would you like to come?
2. 讨论未来计划
1) 用 “be gonig to” 讨论未来计划
Be going to is often used with future plans which will probably take place, but have not been formalised. This means that the exact details, such as what time and where, have not been agreed on.
用 “be going to” 讨论未来计划，能够表明这种方案很可能会产生，但并未宣布明确。这就代表着实际的关键点，如方案产生的時间、地址等尚不确立。
I'm going to meet my friends this weekend.
He's going to fix his car later today.
We're probably going to take the train to get there.
2）用现在进行时讨论未来计划
The present continuous is often used with future plans which are almost definite. The details have been decided on and everyone involved knows where they need to be and when.
现在进行时常见来讨论基本上已制订好的未来计划。这类方案的关键点已定，每一个参加者也都了解方案的時间、地址等。
I'm meeting my friends this weekend.
We're going to the cinema tonight.
She's having dinner with the president of the club tomorrow evening.
