介绍:
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SHALL – is used with the present verb tense. 用于现在进行时态。
Shall we go to London on holiday next year? 明年我们去伦敦度假吗？
I think we shall go shopping this weekend. 我想我们应该去购物这个周末。
How many people shall we invite to the party? 我们将邀请多少人来参加聚会？
Shall we go now? 我们现在去吗？
Tip: We usually use SHALL with the 1st person (I) and the 2nd person (We) only.
WE can use “will” instead of “shall” with the 1st , 2nd and 3rd person
Shall 我们通常只使用于第一人称（I）和第二人（我们），will可以代替shall使用，
可以用于第一人称，第二人称和第三人称。
SHOULD – can be used with the past tense, the present tense and the future verb tense.
Should-可以用于过去时态，现在时态和将来时态。
You should wake up. It is almost 8.00 am. 你应该醒来了。现在差不多8点了。
My sister should have called me last week. 我妹妹应该在上周已经给我打电话
People really should start cleaning up after themselves. 人们真的应该开始清理自己。
