他们学习俄语。
It is difficult (for me) to learn Russian.
(我)学俄语是件困难的事。
Only in this way can we learn Russian well.
只有这样，我们才能学好俄语。
I am starting to learn Russian.
我开始学俄语。
We'll learn Russian next year.
明年我们要学俄语。
于是他开始学俄语。
如今学习俄语还有用吗？
坐在车里学俄语超实用！
Only in this way can we learn Russian.
只有这样才能学会俄语。
This is the best way to learn Russian.
（修饰关系）这是学俄语的最好的方法。
From then on he began to learn Russian.
从那时起，他开始学俄语。
We find it most difficult to learn Russian.
我们发现俄语最难学。
If you want to learn Russian, I can help you.
如果你想学俄语，我可以帮你。
Eg: We find it most difficult to learn Russian.
我们发现俄语最难学。
Eg: We find it most difficult to learn Russian.
我们发现俄语最难学。
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