一般将来时表示将要发生或打算要做什么，有多种形式可以来表示这一时态。
1. shall/will 动词原形，单纯指将来发生的事，即客观上必然要发生的事情。
One day we shall make full use of the sun's energy.
Whenever l have time l will come to see you.
2.be going to 动词原形，表示说话人的主观意图，决定或者安排要做的事，将在不久后进行的动作。
We are going to play computer games this evening.
They are going to pay a visit to America.
3.be 动词的现在分词，表示按计划安排将要发生的动作，或说话人感觉大概要发生的事情。能以现在进行时表将来的这类动词，常常是表往返运动的动词，有go，come, leave，start，move, sail, arrive, take off, set out, return等。
He is leaving for Japan tomorrow.
Hurry up! The airplane is taking off.
4. be 动词不定式，表示计划、约定、安排、命令、要求等即将发生的动作，有必须，不得不，应该等意思，动作受说话人意志的控制。
They are to answer for all these things.
According to his itinerary, he is to arrive here tomorrow.
5.be about 动词不定式，表示最近即将发生的动作。
The meeting is about to begin.
He is about to adjust the generator.
6. be likely（or liable, unlikely，certain,sure,bound）to 动词原形，含有将来意义，时态用一般现在时。
He is likely to attend this meeting.
They are certain to take good care of you.
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