Most of the auxiliary verbs are defective in conjugation; that is, they are used only in some of the moods and tenses; and when unconnected with principal verbs, they are conjugated in the following manner:

MAY.
Pres. Tense Sing. I may, thou mayst, he may.
Plur. We may, ye or you may, they may.
Imperf. Tense.Sing. I might, thou mightst, he might.
Plur. We might, ye or you might, they might.
CAN.
Pres. Tense.Sing. I can, thou canst, he can.
Plur. We can, ye or you can, they can.
Imperf. Tense. Sing. I could, thou couldst, he could.
Plur. We could, ye or you could, they could.
WILL.
Pres. Tense.Sing. I will, thou wilt, he will.
Plur. We will, ye or you will, they will.
Imperf. Tense.Sing. I would, thou wouldst, he would.
Plur. We would, ye or you would, they would.
SHALL.
Pres. Tense.Sing. I shall, thou shalt, he shall.
Plur. We shall, ye or you shall, they shall.
Imperf. Tense.Sing. I should, thou shouldst, he should.
Plur. We should, ye or you should, they should.