非谓语的一个小问题i heard her crying when i walking past.i sat near h

第一句里heard就是hear的过去时没什么特殊的
第二个也是过去时,因为有and所以和前面时态要保持一致
因为前面是sat所以后面要用heard
至于你说的非谓语
第一句里crying,和第二个里面的singing是非谓语
I heard her crying when i walked past.
I sat near her and heard her singing the new song.