1- In Infinitive :
To be:
which means that it depends upon the careful posing of questions to be answered by the critical examination of all the available sources of evidence
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2- In Present:
am, is, are
Is:
the historical explanation is necessary in order to assess the future prospects of our society
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Am:
For this I am grateful to those students who have worked through the subject with me
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Are:
Both these points are valid and need to be recognized
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3- In the past:
was, were
was:
The transformation to settled agrarian communities was accompanied by an acceleration in the growth of technical skills.
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Were:
human societies were poised for another profound transformation to the beginning of urban communities
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4- Present Participle:
Being:
Being harder than copper bronze provided a useful material for cutting tools and weapons
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5- Past Participle:
Been:
This has not been a comfortable period in world history
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6- Present Subjunctive:
Be:
In this book we will be concentrating on the last three centuries of this development
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7- Past Subjunctive :
were
Metal working involved hard physical labour and metal goods were highly prized
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8- Imperative:
Be:
even though it will frequently be necessary to comment on aspects of their relationship
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