请问这句话有没有错误The trick to saying No is be warm but firm.请问is后面可以跟be吗?

请问这句话有没有错误The trick to saying No is be warm but firm.请问is后面可以跟be吗? 这句话有没有错误, Does nobody know the answer?这句话有没有错误. the competition whose purpose is pay attention to pertect of environment .请问这句话有没有错误. 判断对错：reading is not the only way to gain more knowledge but the best.请问这句话上表达有没有错误?请指正,谢谢! 请问这句话有没有错误?：nobody can changed the developing of this matter to a right course有的话请改正， Xiamen is a beautiful city near the sea.这句话有没有错误Xiamen is a beautiful city near the sea.这句话有没有错误? He is from the USA.这句话有没有错误?the能不能用在这里? 这句话The wounded were seen sent to the hospital immediatley.有没有错误? it's the most important not to play with the animals这句话有没有错误 请问下面这句话有没有错误?Some others are against such a point. The difference of life along the river请问这句话语法上有错误吗? “Hold on tight and off we go,” said the crocodile.请问这句话有没有错误,off是干嘛用的,把and off去掉是不是更通顺? 看看这句话有没有错误：Smile is the sunshine and lights your life. Have you got the e-mail address?这句话有没有错误? They can get back to work within the time allowed这句话有没有错误? Thousands of people will go watch the basketball match.这句话对吗?有没有错误? You need some warm clothes for the winter.这句话有没有错误?