English verb conjugation MUST FREEZE

Irregular verb: freeze - froze - frozen

Affirmation

Simple form

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it must freeze
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V-ing form

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it must be freezing
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Perfect

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it must have frozen
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V-ing perfect

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it must have been freezing
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Simple form

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it mustn't freeze
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V-ing form

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it mustn't be freezing
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Perfect

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it mustn't have frozen
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V-ing perfect

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it mustn't have been freezing
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Simple form

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must it freeze?
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V-ing form

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must it be freezing?
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Perfect

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must it have frozen?
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V-ing perfect

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must it have been freezing?
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Simple form

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mustn't it freeze?
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V-ing form

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mustn't it be freezing?
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Perfect

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mustn't it have frozen?
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V-ing perfect

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mustn't it have been freezing?
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