請教英文句子

I like Sushi. I can eat Sushi every day.
我喜歡壽司，我可以每天都吃壽司。[意思認真表達你真是會這樣做]

I like Sushi. I could eat Sushi every day.
我喜歡壽司，我希望每天都能吃壽司。[意思你希望如此，但表示你明白不能真的每天吃壽司，所以應用could作為假定式]

“Can” is used to express ability, possibility and permission.
Ability
Examples: Scientists can now decode DNA.
Possibility – general, theoretical possibility
Examples: Health care can be influenced by government policies.
Permission
Example: Can I open a window?

“Could” is the past of can and expresses past ability
Example: The rats could choose different paths in the maze.
Problems
“Could” also expresses possibility
When used with the present ‘could’ takes the meaning of ‘might’ and shows specific possibilities.
Example: The cells are not dividing; they could be in lag phase.
Using ‘could’ introduces doubt and can suggest that the author lacks confidence in the results or conclusion.
In general, ‘could’ implies more distance or less likelihood than ‘can’. Often both can and could are acceptable in a sentence, but alter its meaning.

所以：
I like Sushi. I can eat Sushi every day.
我鍾意壽司。我每日食壽司都冇問題。（絕對可以）

I like Sushi. I could eat Sushi every day.
我鍾意壽司。要我每日食壽司應不成問題。（應該可以）

'can' refers to your ability, 'could' refers to your choice.

'I can eat sushi every day'' means 'I do not mind eating sushi every day' with the following implication:
(1) you may not be able to afford it
(2) your parents may not allow you doing it
(3) you have no commitment

'I could eat sushi everyday' means 'It is possible that I may choose to eat sushin everyday' with the following implication:
(1) it is possible but not necessarily so
(2) there is no surprise if you eat sushi everyday
(3) to reinforce 'I like sushi', but no commitment at all.

Actually, these two sentences are almost the same, but "can" is more certain than "could". (hope i can help u ^_^)

你應該講I like Sushi. I can eat Sushi every day.
因為I like Sushi. I could eat Sushi every day的could係past tense.錦就會變左有咩可能發生.

我喜歡壽司。我每天可以吃壽司。

我喜歡壽司。我每天都可以吃壽司。