2nd is correct.

"This" is used to indicate singular thing or person which we have near.(ex) this is my pen. 2)this is my brother. "These" is used to indicate plural things or persons which we have near.(ex)these pens are expensive 2)these are my classmates. "That is used to indicate singular person or thing, especially when he/she/it not near the person speaking.(ex) yesterday I lost my purse that was my lucky purse."Those" is plural of that,it remains same(ex) yesterday I gave you sweets those were my mom's preparation.

not others that who answered for my questions.

your question should be: where are you from?

Is she from India? your question is correct.what's your doubt?

scored above 100 marks.she gave gifts according to our marks.she used to write proverbs on our Black board.she told us to follow certain rules about how to behave in class,and how to behave as a student .sometimes she shared some life experiences which we really want to know...are these sentences correct any kind of mistake please correct it.

True.

it's a rule in simple present tense.For He,she,it and any singular noun we should use doesn't to frame a question.

Is,do,does these words used to framing the questions in simple present.(Ex)1. Is she a teacher 2.Do you work in ABC private limited 3.Does she have a car.Look at the examples if the sentence content with verb then we should use do/does,if verb is not there we should use "is"

all the sentences have written in simple present.