我想这对我来说是有用的。
I think it is useful to watch advertisements.
我认为观看广告是有用的。
I think it is a very good useful concept.
我认为这是一个很好的有用的理念。
I think English is very useful and it is very difficult and exciting.
我认为英语是非常有用的它是非常困难和令人兴奋的。
I list this first because I think it is probably the most useful technique.
我把这个技巧列在第一位，因为我想这是最有用的。
I think it is a very useful international language especially when working with foreigners.
而且我认为英文是很重要的国际语言，尤其是和外国人工作的时候。
The teacher says it is useful, but I think it is difficult.
老师说这很有用，但我认为这很难。
I like self — studying I think it is very useful.
我喜爱自我学习我认为这是非常有用的。
I think dictionary is the most useful book, because it can teach us a lot.
我觉得字典是最有用的书本，因为它能教给我们很多知识。
I just think it is much more useful and the other is more playful.
我只是认为它是非常有用的，另一个是更为有趣。
I just think it is much more useful and the other is more playful.
我只是认为它是非常有用的，另一个是更为有趣。
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