'Could get' or 'could have gotten', depending on context.
For example, "We can get a car" is present tense, and its past tense equivalent is "We could have gotten a car".
Another example: "We can get distracted so easily" is present tense, while "Back then, we could get distracted so easily" is past tense.
The past tense of change is changed.
Could is already the past tense. It is the past tense of the verb "can".
Yes. Could is the past tense of can. Couldn't/could not is a negative form.
"Always" is not an action, verb, or motion. It will not change form from present to past tense.
could not/couldn't
"Red" is a color, not a verb. It does not have a tense, and would not change into a past tense. You probably could say "reddened" is the past tense of red.
The past tense of change is changed.
Could is already the past tense. It is the past tense of the verb "can".
Available is an adjective, so does not have a past tense. Only verbs have past tenses. If, however, you wished to change "It is available" to past tense, you could either say, "It was available", which is past simple tense, or "It had been available", which is past perfect tense.
The past tense of can is could.
The past tense is had.
The past tense of is not is was not. (Not is an adverb and does not change from one tense to another.)
The past tense is changed.
The past tense is 'knew'.
The past tense of susceptible is susceptible. The word does not change its form in the past tense.
Hurt doesn't change from present to past tense. The past tense and past participle is hurt.
Yes it's the past tense of "can"