PREPOSITION ON/IN....AS vs. LIKE....The verb FALL.

[Jesule]

Hello! How are you?. I´ve got these three questions. Thanks in advance!

1.- "The knife is ON the wall". Is the preposition used correctly here?. I hesitate because I think the knife is not really ON in this situation. I mean "Someone threw the knife and made it stay there". Should it be maybe IN?

2.- AS-LIKE. I have studied the grammar about this conjunctions
but I still hesitate. Sometimes I think I can use both to mean
the same thing.

Can I say this sentence in both ways?


a.- They fly LIKE birds.
b.- They fly AS if they were birds.

Has it got the same meaning?.


3.- FALL. "The curtains fell yesterday". I think I could need something in this sentence. SHould I use "down the floor" to mean
what I am trying to?. I mean "They are on the floor".

"The curtains fell down the floor yesterday"

But, My final question is: Could I use FALL alone to mean
that?.
Isn´t it obvious they are on the floor?

"The curtains fell yesterday"


Thanks a million!

Jesús

[Casiopea]

1."The knife is in the wall". <The blade is in the wall.>

2a. They fly like birds. <"like" + noun>
2b. They fly as if they were birds. <"as if" + subject+verb>

3a. "The curtains fell yesterday".
3b. "The curtains fell down on/to the floor yesterday"

Could I use FALL alone to mean
that?

Yes.