掌握一门外语。
It's not easy to master a foreign language.
掌握一门外语并不容易。
To master a foreign language is necessary.
学好一门外语是必须的。
To master a foreign language is necessary.
掌握一门外语是必要的。
It is not easy to master a foreign language.
掌握一门外语不容易。
I think it hard to master a foreign language.
我认为掌握一门外语是很难的。
It is necessary to master a foreign language.
掌握一门外语是有必要的。
It is necessary to master a foreign language.
掌握一门外语很有必要。
Its of great help to master a foreign language.
掌握一门外语很有帮助。
They found if hard to master a foreign language.
他们发现要掌握一门外语时困难的。
It requires efforts to master a foreign language.
掌握一门外语需要种种努力。
To master a foreign language is not an easy thing.
掌握一门外语不是一件容易的事。
I think it important to master a foreign language.
我认为掌握一门外语很重要。
It takes a long time to master a foreign language.
掌握一门外语需要很长时间。
We find it necessary to master a foreign language.
我们发现掌握一门外语很有必要。
It is very difficult to master a foreign language.
精通一门外语非常困难。
I don't think it easy to master a foreign language.
我觉得要掌握一门外语不容易。
They find it difficult to master a foreign language.
他们发现掌握一门外语非常不容易。
It is important for us to master a foreign language.
我们掌握一门外语是很重要的。
It is necessary for us to master a foreign language.
精通一门外语，对我们来说是必要的。
It is important for us to master a foreign language.
对于我们来说，掌握一门外语是十分重要的。
I think it easy for you to master a foreign language.
我认为你要掌握一门外语是很容易的。
I think that is possible to master a foreign language.
主谓一致在数上是否违背了语法一致的原则。
It's very important for us to master a foreign language!
对我们来说，掌握一门外语是非常重要的哦！
It is essential that we should master a foreign language.
我们掌握一门外语是很有必要的。
It is impossible to master a foreign language in a month.
在一个月内掌握一门外语是不可能的。
To master a foreign language is really important nowadays.
当今掌握一门外语真的很重要。
They found that to master a foreign language is difficult.
他们发现要掌握一门外语是困难的。
They found to master a foreign language is very difficult.
他们发现要掌握一门外语是很困难的。
It is necessary for us youths to master a foreign language.
对我们年轻人来说，掌握一门外语是必要的。
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