be to和be going to
be to 表示客观安排或受人指示而做某事。
be going to 表示主观的打算或计划。
I am to play football tomorrow afternoon.（客观安排）
I’m going to play football tomorrow afternoon. （主观安排）
一般将来时
1）shall用于第一人称，常被will 所代替。
will 在陈述句中用于各人称，在争求意见时常用于第二人称。
Which paragraph shall I read first.
Will you be at home at seven this evening?
2）be going to +不定式，表示将来。
a. 主语的意图，即将做某事。
What are you going to do tomorrow?
b. 计划，安排要发生的事。
The play is going to be produced next month.
c. 有迹象要发生的事
Look at the dark clouds, there is going to be a storm.
3） be +不定式表将来，按计划或正式安排将发生的事。
We are to discuss the report next Saturday.
4）be about to +不定式，意为马上做某事。
He is about to leave for Beijing.
注意：be about to 不能与tomorrow, next week 等表示明确将来时的时间状语连用。

#g_kclist{font-size:12px;width:100%;float:left; margin-top:5px;} #g_kclist a{color:#000; text-decoration:none} #g_kclist h2{margin:0px;padding:0px;font-size:14px; text-align:center;background:url(/pets/Files/2011-5/13/168377016.jpg ) no-repeat;line-height:31px;color:#fff} #g_kclist table{line-height:25px;background:#0056A3;margin-top:8px} #g_kclist table td{ text-align:center;background:#fff} #g_kclist table td.td1 a{color:#f00} #g_kclist table th{background:#F2F7ED;color:#525F46} .STYLE2 {font-size: 12px}