There were not anything in sight. were 还是was? why

There were not anything in sight. were 还是was? why 为什么是There were not any in sight而不是there was not any in sight there were not any in sight 请问there were no any in sight,而不是there was no any in sight there were no more mountains in sight.为什么用were 不用was there were no more mountains in sight 我想不通为什么用no 不能用not No buses_____that steet and there were no taxis in sight 根据there was no one in the park.there were no people 还是 there There was/were问题 why not( ) help when you were in trouble? .--- Why not ________ for help when you were in trouble?--- 是there was heavy wind yesterday还是there were