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Dear Sir,
May I have clarifications for the following:

1)a)Linking Verb is also called as ........ verb.
b) Why does SAY become SAID (according to the rule if a word ends in consonant plus Y SAY should theoritically become SAIED????
2) Is it possible for "must" to be used in the past tense? If yes, can i have an example?
3) In which tense is the below mentioned sentence?Please explain.
"I must have put my books in my bag."
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1 a) copulative
1b) Dictionary.com gives 2 reasons a) Past tense said is a contraction of "sayed", and b) the past tense said developed from Old English form segde. Either way, it is an irregular verb form.
2)I don't think there is a past tense formed with the modal auxilliary must.
3 "must" is a modal auxilliary in the present perfect tense of the verb put
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Just a couple more notes.

For #2, if you are looking for the "must" of obligation, then for the past we convert it to "had to" or "was requried to."

She said, "You must be home by 7."

She said that we had to be home by 7.

With #3, that "must have" is used to mean "it's the only logical conclusion." Sort of "Given the facts as I know them, the situation must be that that..."
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Comments  
Just a couple more notes.

For #2, if you are looking for the "must" of obligation, then for the past we convert it to "had to" or "was requried to."

She said, "You must be home by 7."

She said that we had to be home by 7.

With #3, that "must have" is used to mean "it's the only logical conclusion." Sort of "Given the facts as I know them, the situation must be that that..."
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