have no problems (in) doing sth.中的problem永远都加s吗?

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• have no problems (in) doing sth.中的problem永远都加s吗?
• teachers' room;the teachers'room.this is ()room,这里应该选哪个?为什么有些人说加the 有些人说不加the ,我都搞不清楚了,还有heavy traffic是要加冠词的吗?他可不可以加any,或者some?；have ( ) intrest in,括号中是填an,还是the ,还是零冠词?；belief加了s之后才是信仰的意思,还是不加s也有信仰的意思?
• hundred of 、thousand of、million of 、billion of 如果运用在句子中,要不要加“s”呢eg:there are hundreds of people 这里hundred 加了s 但名词没加si have a couple of thousand pounds in the bank.i can afford the precious piano.这里thousand没有加s但后面的名词加了sThousands of letters are never delivered because the addresses are incorrect.这里的thousand和 letter都加了s 能说说为什么吗
• 1.是have problem (in) doing sth.还是have problems (in) doing sth.这里的problem可不可以加s 2.如果是很困难的话problem前加什么?
• do you have any questions和do you have any problem加s的问题口语中问道“你还有问题吗?”的时候,如果用到any,any后面的可数名词要加s吗?很常见的Do you have any questions为什么question后面要加s?那Do you have any problem后面要不要加s呢?
• have trouble in doing have difficult in doing have problem in doing这三个固定搭配中trouble difficulty problem用加s 为什么这三个固定搭配中trouble difficulty problem用加s吗 为什么
• 是否有have a difficulty doing sth.It's difficult to do sth.It's a good time to do sth.have a good time doing sth.have problem doing sth.have a difficult time doing sth.的形式?还有,a good time是名词吗?如果有上述形式,和a good time是名词的话,我可否总结成：It's +n.+to do sth.It's +adj.+to do sth.have +n.+doing sth
• 英语翻译：你愿意帮助她学习英语吗?
• 由M个氨基酸构成的一个蛋白质分子,含有六条肽链,其中两条是环状多肽.该蛋白质分子含有肽键数