+ The first verb is in the +Indicative
Mode;+ the second in the +Potential Mode;+ the third in the +Subjunctive
Mode;+ the fourth in the +Imperative Mode.+
For the two forms of the verb called the +Participle+ and the +Infinitive,+
see Lessons 37 and 40.
_I walk. I walked. I shall walk._ In these three sentences the manner of
asserting the action is the same, but the time in which the action takes
place is different. _Walk_ asserts the action as going on in present time,
and, as +Tense+ means time, is in the +Present Tense.+ _Walked_ asserts the
action as past, and is in the +Past Tense.+ _Shall walk_ asserts the action
as future, and is in the +Future Tense.+
_I have walked out to-day. I had walked out when he called. I shall have
walked out by to-morrow._ Have walked asserts the action as completed at
the present, and is in the +Present Perfect Tense.+ _Had walked_ asserts
the action as completed in the past, and is in the +Past Perfect Tense.+
_Shall have walked_ asserts action to be completed in the future, and is in
the +Future Perfect Tense.+
_I walk. Thou walkest. He walks. They walk._ In the second sentence _walk_
is changed by adding +est+; in the third sentence, by adding +s.+ Verbs are
said to agree in +Person+ and +Number+ with their subjects.
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