Are is a present tense verb so "whales are mammals." is a present tense sentence.
Present tense.
Past TensePast Continuous TensePast Perfect TensePast Perfect Continuous Tense
There are four types of past tense:Simple past tensePast perfect tensePast continuous tensePast perfect continuous tenseIf you are referring to the two different types of verbs then they are regular and irregular.
The six basic tenses are:Past tensePast perfect tensePresent tensePresent perfect tenseFuture tenseFuture perfect tense
Were is a past tense form of be. The future tense of be is will be.
past tense is got future tense is will get
Am, is, and are are present tense forms of be. The past tense forms of be are was and were. The future tense of be is will be.
The future tense is will carry.
The future tense of "was" is "will be."
The future tense of "seek" is "will seek." The future tense of "bring" is "will bring."
The future tense is will break.
"Which" is present tense and "will break" is future tense.