有些简单的英语,提问during the holiday 对还是 during holidays that report is still incomplete.为什么要加is?the scientific symbol for water.为什么用for作为介词It doesn't matter.that's right.和that's all right.在什么场合中用?

1.一般用前者
2.incomplete是形容词啊,be +形容词表状态.
3.水的科学的符号表示. symbol for 某某的标志
4.that's right.那是对的.例:
I think you will leave soon.
That's right.
that's all right=that's Ok
一般用于答谢的语句,或回答别人道歉的语句.
例:Thank you for helping me so much.
That's all right(You are welcome).

during the holiday 对
is 系动词一定要加
For为介词习惯用法
平时，正式皆可

during the holiday 对还是 during holidays 前者特指一个节假日,（如刚刚过去的10.1）,后者泛指节假日!that report is still incomplete.为什么要加is?该句is是助动词,是构成一个完成句子的必要成分!the scientific...

during the holiday
因为REPORT是不可数名词
FOR表示“。。。的” 的意思
第一个表示没关系的意思。道歉或客气时用。
第二个是表示OK的意思。肯定的回答。