"It was very cold on the mountains."
It is already in past tense, because it has the word built, which is in past tense. In present tense, it's, "You are building the boat very quickly."
i do not think there is a past tense of "neat"...."your room is very neat" (present tense) and "her room was very neat" (past tense)...same word.
"You were very happy."
were is a past tense plural be verb. They were very unhappy
She knew him very well.
I am very sure the past of teach is taught.
Swoll is slang word that is used as an adjective meaning very muscular. It is not a verb, so it has no past tense.
You can simply say thank you in the past tense, such as: Thank you for your letter dated... I am very grateful for your help on . . . , thank you. Please accept my belated thank you (explain why its late)
"Is" is a present tense. "Was" is past tense. As in: Carra is watching TV in the living room right now. Two hours ago she was sleeping in her room.A bit more:The word 'is' should be used when referring to a present tense, such as "He is a good student". The word 'was' should be used when referring to past tense, such as "He was a very good student."Other examples: She is a very pretty girl. (present tense) She was a very pretty girl. (past tense).He is employed by ABC Bank as a loan officer. (present tense)He was employed by ABC Bank as a loan officer. (past tense)He was a loan officer, but was later promoted and is now Vice President of the bank. (using present and past tense)
some examples are the very cold temperature which is dangerous and anything could cause an avalanche when on high, cold,snowy mountains...
'were' is used when you wish to talk in past tense. it is the past tense version of 'are' examples: the men were hunting the fox. those days were very difficult for me.
the past tense of lose is lostExample: You lost a lot of weight doing those exercises I recommended. Very good!