a. Simon must be working on the computer. 想必正在
b. Simon may/ might be working on the computer. 可能正在
c. Simon can be working on the computer. 可能正在
d. Simon can’t be working on the computer. 不可能正在
e. Simon should be working on the computer. 理应正在
f. Simon shouldn’t be working on the computer. 原不该正在
g. Simon needn’t be working on the computer. 原可不必正在
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