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taking to be taken being taken to take
having crossed crossing crossed to cross
I=E/(R+ro) I=I/E(R+ro) I=E(R+ro) I=(R+ro)/E
having crossed crossing crossed to cross
I=E/(R十ro) I=l/E(R+ro) I=E(R十ro) I=(R十ro )/E
did he cross he crossed had he crossed he had crossed
I=E/R+RO U=ＩRO U=E+IRO I =(U-E)/RO
crossed have crossed was crossing had been crossing
when; who that; which that; who when; which
wouldn’t couldn’t daren’t mustn’t
cross crossed have crossed will cross
I=E/（R+ro） I=E（R+ro） I=R+ro/E
While crossing When cross Crossed Being crossed
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