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The 'AND' operation can be defined on the set of bits {0, 1} as follows 1 . 1 = 1, 1 . 0 = 0, 0.1 = 0, 0.0 =..- The Simple Present Tense is used to express habitual action or general truths.
- Peter takes his dog for a walk.
- I drink coffee everyday
- The sun rises in the east
Is taking
Present Continuous Tense is used for an action going on at the time of speaking.
Peter is taking his dog for a walk (now).
I am reading a book (now).
The boys are playing hockey outside (now).
Has been taking
The Present Perfect Continuous is used for an action which began at some time in the past and is still continuing.
Peter has been taking his dog for a walk regularly.
I have been studying since 5 O'clock.
I have been watering the plants, yet they are dying.
Has taken
Present Perfect Tense is used to denote an action that began in the past and the effect of which has continued to the present

