我的妹妹很可爱用英文表达是：My sister is very lovely；

sister：n. 姐; 妹; (称志同道合者)姐妹; 护士长。

lovely：adj. 美丽的; 优美的; 有吸引力的; 迷人的; 令人愉快的; 极好的; 亲切友好的; 慷慨大方的; 可爱的。

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She doesn't play as well as her sister.

她演奏得不如她姐姐。

My sister and I used to quarrel all the time.

我和妹妹过去老是吵架。

My sister came along just to give me some moral support.

我姐姐只是过来给我一些道义上的支持。

How lovely to see you!

见到你多么让人高兴！

You've got yourself into a lovely mess, haven't you?

你惹的这麻烦可真够瞧的，是吧？

It was no hardship to walk home on such a lovely evening.

在这么一个宜人的傍晚步行回家一点也不辛苦。