麻烦帮我分析一下英语句子1.Bases supplying such raw materials are also to be expanded.2.Ordering tickets in advance by phone is a great convenience.

1.Bases supplying such raw materials are also to be expanded.
主语Bases；谓语are also to be expanded；定语supplying such raw materials
这里的谓语是用的是be to do结构的被动语态形式be to be done
be to do 结构有至少两种用法：
1.表示按计划即将发生的事情，也可以把它看成是将来时的一种形式
2.表示情态含义：=must/should/can/may do的含义，它的被动语态形式具有must/should/can/may to be done的含义
supplying such raw materials是现在分词短语作定语修饰主语Bases.
它相当于一个定语从句：Bases supplying such raw materials =Bases that supply such raw materials
整句话的意思是：提供这类原料的基地也将被扩建。
2.Ordering tickets in advance by phone is a great convenience.
主语：Ordering tickets in advance by phone
Ordering引导的是一个动名词短语作主语；
in advance意思是“提前”
by phone意思是通过电话（用电话）
is a great convenience是系表结构做谓语
整句话的意思是：
提前通过电话订票是很多方便的。

1:基地的供给就像那些未加工的材料一样需要扩大发展。
2.提前用电话订购票是极大的方便！

1.主语是Bases,supplying such raw materials 是修饰语,修饰主语,are also to be expanded是表语.主干是Bases are to be expanded.
2.Ordering tickets 是主语,主干是Ordering tickets is a convenience.

提供这些原材料的基础设施也得到了扩建
提前打电话订票带来很多方便