Would you simply show me which one of the following bold parts you would use?

  1. Something must be taken into account.

  2. Something must to be taken into account.

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    Must must be followed by a main verb in the base form (so must be). I think the only modal verb that is followed by an infinitive (to+V) is ought. – None Oct 9 '14 at 7:36
  • Must must be followed by a main verb in the base form but then good to note that This is a must-to-have gadget if you deal with machines. is valid! – Maulik V Oct 9 '14 at 9:24
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    @MaulikV You're mixing up must to have and must have, but your confusion isn't actually relevant to this question, so if you'd like to know more, I suggest you ask about it separately. – snailcar Oct 9 '14 at 9:58
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    @Laure And need and dare. Technically, however, when these verbs are used with the to- marker they are not acting as modals but as quasi-modals! – StoneyB on hiatus Oct 9 '14 at 11:26
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    Have heard of must-have gadgets but never must-to-have gadgets. – Tᴚoɯɐuo Oct 9 '14 at 14:28

It sounds rather weird to say that "something must to be taken into account". Nor do we find the use of "to" after must in a dictionary or grammar book. The grammar says that we usually use an infinitive (the basic form of a verb) without to after the auxiliary "must".

So the right sentence is "something must be taken into account.

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