说一下错误点

1.spend on 固定搭配
2.动词做主语,要ING形式
3.坐下,是sit,seat是座位的意思,sit的过去式和过去分词都是原形
4.缺少主语,改为he remembered he was knocked down by a car.这个句子要使用被动语态

1spend后面应该加时间，用的不对，中式英语
2应该是living in a village 动名词做主语
3seat是及物动词，后面不用加in，应该改成sat会更好
4被动语态，he remembered （he was）knocked down by a car

1my famliy spent the summer vaction wandering europe
spent+时间+doing

2living in a village alone doesn'make him feel lonely
DOES是动词的标志，一个句子只能有一个动词。

3he entered the classroom and seated himself in front of the audience
3he entered the classroom and sat in front of the audience
考察SET SEAT的用法。

4he remembered being knocked down by a car
remember Doing sth 是说记得怎么了， 而他是被撞所以用被动语态

spend XXX on something
花费XXX在某事上
spend XXX （in） doing something
花费XXX做某事 XXX可以是时间，金钱，假期，或其他的
my famliy spent the summer vaction wandering europe
一个句子不能有两个动词live 和 make是两个动词
live in a village alone作为句子的主语，动词应改为动名词living in a village alone 另外doesn't是助动词
seat只能表达使Xx就座的意思，所以要表达主观的左下，用sit过去时sat
句子要表达的意思是它被一辆车装倒，这点由by a car可以看出
所以用被动语态BE+过去分词
he remembered being knocked down by a car
记得过去做过的某事用remember Doing

1my famliy spent the summer vaction to wander europe
my famliy spent the summer vaction wandering europe.

2live in a village alone doesn'make him feel lonely
living in a village alone doesn'make him feel lonely

3he entered the classroom and seated in front of the audience
he entered the classroom and sat in front of the audience

4he remembered knocking down by a car
he remembered being knocked down by a car