英文grammer 問題[20點]!!!!!!!!!!

English does not have a “future tense”, but uses a variety of forms to talk about the future. The choice of form often depends on whether we are making a prediction, expressing an intention or talking about an arrangement.

(1) Present simple

We can use the present simple for the future, but only for what we see as a part of a timetable: 時間表上有, 定期.

The ferry leaves at two o’clock.
The tour departs on December 1st for 15 days and costs $3000.
The meeting is on December 15.
The train leaves in ten minutes.

Do not use present simple for plan and intention.

(2) Present continuous (早已安排, 不是在那一瞬間的決定, 不是預測)

We can use the present continuous to describe an event in the future which has already been arranged by the time of speaking. It may be future plan, but this plan is not fixed as the present simple.

We are seeing a musical at a theatre next week. (= We have got the ticket.)
I am doing some shopping this afternoon. (= I have planned my day so that I can do some shopping.)

We also use the present continuous for future event where we have made some form of commitment.
I am staying in tonight. I have got loads of paperwork to do.
The focus here is on arrangement. There is no suggestion that the speaker wants to stay in, in which is the case when we use be going to.
I am going to stay in tonight. (The focus is on intention)

We can’t use this tense with events which are beyond human control e.g. the weather, because these events are predictions, not intentions or arrangement.
It is snowing tomorrow. (wrong)

Use present continuous for arrangement.

There are other ways to talk about the future, We also use will, be going to, be to, be about to, will be doing, will have done, may, might, could, to-infinitive after aim(expect, hope, intend or plan).