learn的过去式和过去分词

Learn \Learn\ (l[~e]rn), v. t. [imp. & p. p. {Learned}
(l[~e]rnd), or {Learnt} (l[~e]rnt); p. pr. & vb. n.
{Learning}.] [OE. lernen, leornen, AS. leornian; akin to OS.
lin[=o]n, for lirn[=o]n, OHG. lirn[=e]n, lern[=e]n, G.
lernen, fr. the root of AS. l[=ae]ran to teach, OS.
l[=e]rian, OHG. l[=e]ran, G. lehren, Goth. laisjan, also Goth
lais I know, leis acquainted (in comp.); all prob. from a
root meaning, to go, go over, and hence, to learn; cf. AS.
leoran to go. Cf. {Last} a mold of the foot, {lore}.]
1. To gain knowledge or information of; to ascertain by
inquiry, study, or investigation; to receive instruction
concerning; to fix in the mind; to acquire understanding
of, or skill; as, to learn the way; to learn a lesson; to
learn dancing; to learn to skate; to learn the violin; to
learn the truth about something. ``Learn to do well.''
--Is. i. 17.

Now learn a parable of the fig tree. --Matt. xxiv.
32.

2. To communicate knowledge to; to teach. [Obs.]

Hast thou not learned me how
To make perfumes ? --Shak.

Note: Learn formerly had also the sense of teach, in
accordance with the analogy of the French and other
languages, and hence we find it with this sense in
Shakespeare, Spenser, and other old writers. This usage
has now passed away. To learn is to receive
instruction, and to teach is to give instruction. He
who is taught learns, not he who teaches.