过去分词 prepared 用于系表结构,意思为“为……做好准备；打算”,常用于以下句式：
be prepared + for （或 against ）引起的短语.例如：
They were prepared for the worst.
他们已准备好应付最坏的情况.be preparing for 是使用的动词的现在进行时态,根据prepare的意思,这个短语指正在为……（for后面的介词宾语部分）做准备；
Before the spring Festival,the parents and children are all
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