when i opened thedoor ,i found in he come.only in this way w

when i opened thedoor ,i found in he come.
come→came,整句都是过去式,所以come 也要变成过去式.不过这句的found in 不通顺,似有错误,可能是你拼写错了.
only in this way we can improve our english study
we can→can we 因为介词短语（in this way ）提前,全句必须用部分倒装---把can 提前.
he was made work very hard from morning till night .
这句made后面应该加to.make用法：make sb do sth；sb be made to do sth.即：主动时不加to,被动时必须加to.
肯定正确.

when i opened the door, i found in he came. only in this way we can improve our english studies. he was made to work very hard from morning till night.

came; can we;made to work

1come-came
2study-studies对应we所以用复数。
3be did为被动，所以was不对，应为has made~~

came; can we;made to work