Probability-Modal verbs (PAST)Online version Complete the test by Jesus Martinez Castillo 1 The hockey player's injury kept him out of the Stanley Cup Playoffs. He __________ a must have been disappointment. b must have been disappointed. c must have been disappointing. d might have been disappointed. 2 The twins have guilty expressions on their faces. They ______________ a might have done something naughty. b might do something naughty. c must have done something naughty. d must do something naughty. 3 My friend promised to pick me up at 7:00. It's now 7:25 and I don't see him. He ____________ a must have forgotten. b might forget. c might be forgetting. d might have forgotten. 4 My plants are dead. I _____________ a couldn't give them enough water. b must give them more water. c can't not have given them enough water. d can't have given them enough water. 5 Paul's class starts at 8:30. It's 8:45 and he's not here yet. He ______________ a must have been sick. b must be sick. c must have missed the bus. d might have missed the bus. 6 Our son promised to clean his room, but it is still messy. He ______________ a couldn't have cleaned it. b can't clean it. c couldn't to have cleaned it. d cannot clean it. Explicación 1 Disappointment is not a noun, ING form is incorrect here and the speaker is more than 50% certain the player was disappointed 2 The speaker is probably more than 50% certain that they had been naughty 3 A present tense verb is not correct here, a ING verb is incorrect here and since the speaker is probably more than 50% certain by now that his friend forgot, might is not appropriate 4 must and couldn't is ilogical here and a double negative is not appropriate here 5 Must is irrelevant here and we don't know if Paul is sick 6 Can is irrelevant here and the modal 'could' should be followed by the base form of a verb, not 'to'
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