英语语法专家来
问题描述：
英语语法专家来
写作的时候是
I like English,but in many times ,the marks i got in English tests were not perfect正确还是
I like English .But in many times ,the marks i got in English tests were not perfect正确
老师好像说过but不能单独放在句首,但如果用逗号有两个,感觉怪怪的
答
第一句正确的（,but in many times,）表插入,第二句把两句分开来了,两个句子无联系