表达个人观点的句子：I think it important/necessary/valuable for us to do something. 也可以用形式主语句子：In my opinion, It is important that we are supposed to do something. 表达理由的句子：The reasons why we should do something are that…, in addition.…
The earth turns around the sun.地球围绕太阳转。
The sun rises in the east, and sets in the west.太阳东升西落。
2. “主语 + 谓语 + 宾语”(即“主谓宾”句型)
这一句型英汉语言的.结构形式完全相同，用以说明“某人或某物做什么事情”，或者说“某人或某物发出了动作，并且其动作涉及到另一个人或物”。
例：I study English.
分析：“我”(主语)“学习”(谓语动作)“英语”(宾语即动作涉及的对象)。
I like swimming.我喜欢游泳。
