I also want to take Chinese painting classes.

错误："also" 应该放在 "want" 之前。

正确："I also want to take Chinese painting classes."

Sam always sits in the basket.

错误："in" 应该改为 "on"。

正确："Sam always sits on the basket."

How Mike come school？

错误："come" 应该用 "comes"。

正确："How does Mike come to school？"

Is Jenny singing？

错误：回答否定句时，应该用 "No, she isn't."。

正确："No, she isn't singing."

I would like a cup of tea to drink.

错误："to" 是多余的。

正确："I would like a cup of tea to drink."

It’s May 2nd.

错误："May" 后面应该加 "2"。

正确："It’s May 2nd."

She’s our principal.

错误："She’s" 应该是 "He’s"，因为后面提到的是男性校长。

正确："He’s our principal."

I love skiing and winter is the best time for skiing.

错误："skiing" 应该用复数形式 "skiing"。

正确："I love skiing and winter is the best time for skiing."

Would you like ______ a picnic this month？

错误："like" 后面应该接动词原形 "to have"。

正确："Would you like to have a picnic this month？"

The price is very suitable for me.

错误："suitable" 通常用于否定句或表示不适合的情况。

正确："The price is very right for me."

这些句子在五年级下册英语学习中较为常见，希望这些例子能帮助你更好地理解和掌握这些常见的语法错误。