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T1WI高信号，T2WI高信号 T1WI低信号，T2WI低中信号 T1WI高信号，T2WI低信号 T1WI低信号，T2WI低信号 T1WI中低信号，T2WI中高信号
could help had helped helped could have helped
W1=W2,I1=I2 W1=W2,I1＞I.2 W1 W1>W2,I1=I2
can help can have helped could help could have helped
did I help other people do I helped other people I helped other people helping other people
I.1＜I.2，W.1=W2 I.1＜I.2，W.1＜W.2 I.1=I2，W.1=W2 I.1=I2，W.1＜W.2
I1I1 I1=I2 ，W1=W2 I1=I2 ，W1
must have helped should have helped needn’t have helped can’t have helped
know, would have helped know, have helped knew, could have helped had known, could have helped
did on did it on helped of helped it of
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