бояться

I'm doing some exercises on Imperative and I meet with бояться that has an imperative rather inusual. Firstly I find this verb as of de II conjugation whereas its Infinitive should make to expect it as a "E" verb. Searching I find this verb in a list with verbs whose stem ends in ж, as держать. Well, let's suppose that because of phonetical proximity it belongs to II cong.
But I find its Imperative бой, бойте. The conjugation of this verb is as follows:
я боюсь, ты боишься, они боятся. Everything will go OK if I suppose that the stem is бой- бо(й)юсь ... But the Infinitive then should be бо(й)ться -> боться and not бояться. I see no reason why the "a" in бой(а)ться should fly. I don't understand. Can you help me? Thanks.

Quote:

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Originally Posted by radomir

But I find its Imperative [s:25j047cg]бой, бойте[/s:25j047cg].

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Where did you find it? That's wrong. Should be бойся, бойтесь.

The -ся wasn't the problem. As a fact I was going to delete this post, since I have solved it. Thank you.

Бояться is one of a few verbs which belong to second conjugation, despite the -я- infix. There is also стоять and спать (and the prefixed verbs you get from them). The imperative forms are бойся, стой and спи.
Beside this, there are around 30 -ать verbs which belong to second conjugation, and all of them have a hissing stem: дрожать, лежать, слышать, звучать, кричать, стучать, трещать...

Thank you for your interesting answer. My mistake was forgetting an orthographical rule:
After vowel can't writen "и" but "й". So for forming Imperative of бояться, where in principle a "и" should be added to the stem боя-, finally it becomes боя- -> бо(я)-иcь -> бойсь. Thank you.