Please can come with different sorts of prefixes, such as "un", "out", "over", "self" and "well".
Examples: "This was an unpleasant surprise". In this sentence we have the prefix "un", meaning that this wasn't a pleasant surprise, that it was a negative surprise.
"You really shouldn't overplease your daughter". In this sentence the prefix "over" shows that not only do the parents please their daughter, but they also please her in a high degree.
a) present progressive
b) past perfect progressive
c) past progressive
d) present perfect progressive
2. They had been camping in the area when the forest fire began.
a) present progressive
b) past perfect progressive
c) past progressive
d) present perfect progressive
3. Kalman had been sleeping throughout the memorable day.
a) present progressive
b) past perfect progressive
c) past progressive
d) present perfect progressive
4. As of next month, my best friend and I will have known each other for twelve years.
a) present progressive
b) past perfect progressive
c) past progressive
d) present perfect progressive
Answers:
1- d) present perfect progressive
Explanation: It is about an action which started in the past and continues up to the present. Plus, the structure "subject+ auxiliary verb (has)+ verb to be in past participle (been)+ verb in gerund shows the verb tense that is being used.
2- b) past perfect progressive
Explanation: It is about an action which was already going on when a certain thing happened, "interrupting" it. Plus, the structure "subject+ auxiliary verb (had)+ verb to be in past participle (been)+ verb in gerund shows the verb tense that is being used.
3- b) past perfect progressive
Explanation: It is about an action which was already going on when a certain thing happened, "interrupting" it. Plus, the structure "subject+ auxiliary verb (had)+ verb to be in past participle (been)+ verb in gerund shows the verb tense that is being used.
4- none of the alternatives; it is a sentence in future perfect tense.
Explanation: it expresses the idea of something that will have been completed at a certain point in the future. Plus, the structure "subject+simple future of verb to have+ past participle of the main verb shows the verb tense that is being used.
The answers are :
Rainsford believes killing humans is murder but has no problem killing animals.
Rainsford believes Zaroff is a murderer because he hunts humans.