The word "my" is incorrect because it should be followed by a noun.
Correct form is "mine" — the sentence should read:
"This shirt is yours and that is mine."
The correct past simple tense is "They attacked me" — no need for "on" with "attack" in this context.
"Ourself" is incorrect – It should be "ourselves" because the subject "we" is plural and needs the plural reflexive pronoun.
The correct sentence is: "We made ourselves tea and talked about the good old days."
"Antihealthy" is not a correct word.
The proper term is "unhealthy."
So the sentence should be "An unhealthy person often falls sick."
When comparing two actions (you go vs. you reach), use comparative form: "faster" not "fastest".
"Fastest" is superlative and used when comparing more than two.
The phrase "in get" is incorrect; it should be "to get" to show purpose or intention.
Correct sentence: "I have always looked for ways to get things done in time."
"An" is incorrect before the consonant sound "black."
It should be "a black kite" because "black" starts with a consonant sound.
After mustn't, we use the base form of the verb, not with 's'.
Correct sentence: We mustn't break the school furniture.
The sentence uses future + conditional, so it needs the subjunctive form "were" instead of "was".
Correct sentence: I won't be able to join you if my baba were at home.