I DON'T THINK HE IS AS GOOD AS HER.句中,能用“so as"结构吗?

I DON'T THINK HE IS AS GOOD AS HER.句中,能用“so as"结构吗? i don't think my pen is so good as his用so good I can never be as good as ..I don’t think my work is as good I don't think he is as tall as his brother.同义句 I don't think swimming is as interesting as hiking I don't think maths is as interesting as English （英语）I don't think swimming is as intereting as hiking.((同义句) I don't think history is as interesting as English.(改同意句) I don't think chemistry is as interesting as physics.改为同义句 I don't think maths is not ____ science A so easy as B less I don't think chemistry is as interesting as physics.I think I don't think art is as interesting as music 同意词组填写I think a