1.My cousin never says a bad word about anyone.
2.We all like our history teacher,because he has a good sense of humour /All of us like the history teacher,because he is humorous.
3.Jim doesn’t think swimming is as exciting as hiking.
4.They often have a great time playing hide-and-seek.
5.She taught herself how to cook yesterday./She learned how to cook by herself yesterday.

1.never为否定的副词，表示从来不的含义，say a bad word表示说坏话的含义，故本句可翻译为My cousin never says a bad word about anyone.
2.表示三个以上都使用all，表示原因用because，a sense of humour表示幽默感的含义，故本句可翻译为We all like our history teacher,because he has a good sense of humour.
3.think从句，用主句的否定结构表示从句的否定意思，as exciting as表示一样激动的含义，swimming为游泳的含义，hiking为徒步旅行的含义，故本句可翻译为Jim doesn’t think swimming is as exciting as hiking.
4.have a great time doing表示做某事玩得开心，play hide-and-seek表示玩捉迷藏的含义，故本句可翻译为 They often have a great time playing hide-and-seek.
5.teach oneself表示自学的含义，疑问的关系词how后可跟动词不定式表示如何去做某事，本题表示过去，主语为she，故自学可以写成taught herself，故本句可翻译为She taught herself how to cook yesterday.

1.My cousin never says a bad word about anyone.
2.We all like our history teacher,because he has a good sense of humour /All of us like the history teacher,because he is humorous.
3.Jim doesn’t think swimming is as exciting as hiking.
4.They often have a great time playing hide-and-seek.
5.She taught herself how to cook yesterday./She learned how to cook by herself yesterday.

1.never为否定的副词，表示从来不的含义，say a bad word表示说坏话的含义，故本句可翻译为My cousin never says a bad word about anyone.
2.表示三个以上都使用all，表示原因用because，a sense of humour表示幽默感的含义，故本句可翻译为We all like our history teacher,because he has a good sense of humour.
3.think从句，用主句的否定结构表示从句的否定意思，as exciting as表示一样激动的含义，swimming为游泳的含义，hiking为徒步旅行的含义，故本句可翻译为Jim doesn’t think swimming is as exciting as hiking.
4.have a great time doing表示做某事玩得开心，play hide-and-seek表示玩捉迷藏的含义，故本句可翻译为 They often have a great time playing hide-and-seek.
5.teach oneself表示自学的含义，疑问的关系词how后可跟动词不定式表示如何去做某事，本题表示过去，主语为she，故自学可以写成taught herself，故本句可翻译为She taught herself how to cook yesterday.