japanese particles

Question 1

wa

Answer 1

topic particle: as for or speaking of (what is being talked about in the sentence)
e.g
contrast marker: usually replaces wo or ga
e.g Sakana wa tabemasu. Demo, niku wa tabemasen

Question 2

desu

Answer 2

is, am or are

Question 3

ga

Answer 3

subject particle
- It can mark the object for certain verbs and adjectives
- it indicates existence : Often used with arimasu and imasu (to have or to exist or there is)
e.g Asoko ni, konbini ga arimasu
second function:
Mark the object of desire