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Im=πI Im= √2I Ie= √2Im Im=√2/2I
Must; can’t May; must Can; mustn’t Can’t; can
Must; can’t May; must Can; mustn’t Can’t; can
won’t needn’t mustn’t don’t have to
i＝ 0.637Im i＝ 0.707Im i＝Im/√3 i＝ 0.5Im
not to swim to not swim swim not to to swim not
won’t needn’t mustn’t don’t have to
not to swim to not swim swim not to to swim not
Im=√3I； Im=√2I； Im=0.707I； Im=1.57I
I=21/2Im I=21/2Im/2 I=2Im I=Im/2
Im=√ 2I； Im=√2I／ 2； Im=I； Im=√ 3I。
Must; can't May; must Can; mustn't Can't; can
Must; can't May; must Can; mustn't Can't; can
Must; can't May; must Can; mustn't Can't; can
not to swim to not swim swim not to to swim not
Im = 2I Im = 2I/2 Im =I Im = 3I。
Must , can’t May , must Can, mustn’t Can’t can
Im=√2I Im=√2I／2 Im=I Im=√3I
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