Habit is rarely used as a verb. It was mainly used as a verb meaning "to inhabit". However, this usage is now archaic which means it is very rarely used.
Habit is primarily a noun. See the related link for more information on the uses of "habit".
Yes, would is past tense form of will. For example a past habit: The dog would wait by the gate every afternoon, for his master to come home.
The tense of "He used to live in a big house" is past simple. The phrase "used to" indicates a past habit or situation that no longer applies in the present.
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense is she did.
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would". The past tense of "to be" is "was" or "were".
HAD is the Past Tense of TO HAVE.
The past tense is had.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."