Solved is the past tense of solve.
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No, it is the simple past tense of to have, or part of the past perfect tense.
Fast, the past tense of must is not musted. Must does not have a simple past tense, in its place "Had to" is used in most cases.
stidiedhas studied because this leaves a sense of present tense where as will study is future tense and had studied is past tense and to put stuied is a simlpe form of the past tense.
Have is not a "to be" verb. Present tense forms of be: am/is/are Past tense forms of be: was/were Being is the present participle, and been is the past participle.
Yes it is.