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1·Many even feel that they lose face if their guests have eaten all the food.

许多人甚至觉得，如果他们的客人把所有的食物都吃完了，他们会觉得很丢脸。

2·We have eaten up all the fruit already, so we'd better go to the supermarket to buy some.

我们所有的水果都吃完了，所以最好去超市买一些。

3·He must have eaten the dinner.

他肯定已经吃过晚饭了。

4·I have eaten breakfast.

我已经吃过早饭了。

5·We have eaten already.

我们已经吃过了。

6·I have eaten meal.

我已吃过饭了。

7·Then the fish eats the algae or eat other fish that have eaten those plants.

然后这只鱼吃了这些海藻，或者吃其它吃了这些植物的鱼类。

8·'I have eaten' is the present perfect tense of the verb 'to eat', 'I had eaten' is the past perfect and 'I will have eaten' is the future perfect.

I have eaten是动词eat的现在完成时；I had eaten是过去完成时；I will have eaten是将来完成时。《牛津词典》

9·She must have eaten too many donuts.

她一定是吃了很多甜甜圈。

10·I have eaten my meal.

我吃完饭了。