Disagree with 1 and 3.
The main difference between "me" and "I" is very easy to remember, as it simply refers to the pronoun type. More exactly, "I" is always used as a subject, while "me" is used as an object. This small and simple difference actually dictates in which situations you should use which.
1. It was —————that gave u the alarm. ( I, me)
It was me that gave u the alarm. I filled it with ME, but it was wrong answer. Please clarify me why should we use I instead of ME.
2. Whom can I trust, if not —————? (he, him). Please explain why should we use him instead of he.
3. He is as good as ———(I, me). I put it as me but it was wrong answer. Please clarify my doubt why should we use I instead of me.
3 answers
If you rephrase each one so you're reading the very basic thought, you should come up with these:
1. I gave you the alarm. (You wouldn't say, "Me gave you the alarm," right?)
2. I can trust him. (Also, the "m" on "whom" gives this one away.)
3. He is as good as I am. (When comparing, make sure you add both verbs and the choice should be clear.)
Copy and paste this for personal pronouns and study the three paragraphs carefully:
guidetogrammar.org/grammar/pronouns1.htm#personal
1. I gave you the alarm. (You wouldn't say, "Me gave you the alarm," right?)
2. I can trust him. (Also, the "m" on "whom" gives this one away.)
3. He is as good as I am. (When comparing, make sure you add both verbs and the choice should be clear.)
Copy and paste this for personal pronouns and study the three paragraphs carefully:
guidetogrammar.org/grammar/pronouns1.htm#personal
Thank you so much