Relative word: which

GPY, at first I think it's SPY ))

Through the examples above and your explanations, I think I have to study so much harder so that I might be able to master this language in the future. Otherwise, any of my sentences may encounter kind of mistakes. Indeed, for me, every part of the language need to be considered thoroughly.

All the things you've explained sound reasonable and understandable for me.

GPY

In your usage, which is transitive, no. (It is possible in a different context for "explain" to be intransitive.)

In respect of "which", yes. We would normally say "the things" rather than "things", but this is unrelated to the main point.

Thank you so much!

Take care!