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1·One thing I am sure of was that she was scared.

有一点我可以肯定的是她被吓坏了。《柯林斯英汉双解大词典》

2·I am sure He has not heard me.

我确定他没有听见我的话。

3·Indeed, I am sure of it.

是的，我敢肯定。

4·This afternoon I am sure Dickon will come.

我敢肯定，今天下午狄肯一定会来的。

5·She'll never get along with him, I am sure of that!

她绝对不会和他和睦相处的，我敢肯定！

6·Come inside at once, you naughty children; I am sure your feet are damp.

马上进来，你们这些淘气的孩子；我敢肯定你们的脚是湿的。

7·In the middle of the night, the grandfather got up, saying to himself, I am sure she is afraid.

半夜里，爷爷坐起身，自言自语道：“我敢肯定她是害怕了。”

8·I am sure, it was a song sung by the animals of long ago and have been lost to memory for many years.

我敢肯定，这是很久以前动物们唱的一首歌，而且多年来已被遗忘。

9·He has promised to finish the job by June and I am sure he will deliver.

他答应在六月底完成这项工作，我相信他会履行诺言。《牛津词典》

10·I don't know anyone here but I am sure I will manage when I find my feet.

我在这儿什么人都不认识，但我确信一旦站住脚就会应付过来。《柯林斯英汉双解大词典》