Question

英语题目，求答案的理由

Answer 1

同学你好：

decide作动词表示“决定做某事”时，需要用不定式to do。比如：
- He decided to help you.
- He decided to make a cake.
- He decided to go swimming.

原句中之所以没有使用不定式，是因为原句用that引了从句，然后从句中用he从新当了主语。比如，上面三句我写的例句可以改写为：
- He decided that he would help you.
- He decided that he would make a cake.
- He decided that he would go swimming.

无论哪种写法，表达的意思没多大差别的。
希望对你有帮助，如果还有问题可以追问，满意的话记得采纳答案~ 祝你学习进步 :)

Answer 2

decide to do sth. 决定去做某事的固定词组搭配。
decide 是动词，后面接做某事时要加to；如果加从句，就要在decide后面加that, that 后跟一个完整的句子。
这道题是把复合句转换成简单句，decided that he would... = he decided to do