m a native chinese speaker and have japanese learning experience.

these two language all have to use chinese characters, chinese is all useing it obvious,and japanese borrowed many many of them and changes or created some new base on it , so you need to let youself see more chinese characters as often as possible.you will find some characters you are interesing to it and you search the meaning and pronunciation of it, when you know one chinese character you might also know what it means in japanese,many of them are same meaning even similar pronunciation.

then,though both language seems has something similar but they are totally diffrent.

japanese‘s grammar are similar with korean that's what people told me all the time, i believe that if someone can speak japanese also can learn korean easier.

and last thing i would agree all peole said above that watch more TV series or movie ect of chinese or any others language you want to learn. see more and hear more definitely could help you to get ues to that language and remenber more even without formal study.

and of course if you like ,i will do my best to help you with chinese or japanses as i can.

only 你是好人 is correct. it means you are a nice/good/kind-hearted person.

the first sentence: 你是很好人. should ad 的 after 很，like 你是很好的人，also means you are a good man ect like above, but bedeck 好人more because 很 means more/very.

the last one 你很好人, if delet 人 would be a correct sentence, means you are good/nice/kind.

1977年12月10日，时隔十年终于恢复高考，约共有570万考生走进高考考场，这规模在历史上是空前的。

这句话需要结合历史去讲。