The verbs will be in their present tense form. The sentence will be referring to something that is presently happening.
I know he is there.
This sentence is in the present tense.
The present tense of the sentence "She turns the light on" is "She turns the light on."
The form of the verb provides this information, although sometimes it needs to be clarified. There are some verbs (such as read) that use the same spelling for the present tense and the past tense. Example: He runs is the present tense. (He is running) He ran is the past tense. (He was running) He will run is the future tense. (He will be running)
The tense for the sentence "I am speaking English" is present continuous tense.
Know is present tense. Exmpl: I know that the word "know" is present tense The past tense of "Know" is "Knew" Exmpl: I knew that the word "knew" was past tense.
The verb in the sentence is in present tense.
That sentence is present tense. "Is" is a present tense linking verb.
The present tense of 'knew' is 'know'.
Present tense.
You convert a sentence in the present tense to a sentence in the past tense by simply changing the verb form to the past tense. You converted a sentence in the present tense to a sentence in the past tense by simply changing the verb form to the past tense.
You say did not know.I did not know the answer to his question.This sentence is a past simple sentence. The word 'did' (past form of 'do') tells us the sentence is past. The main verb 'know' is a present form this is how you make a negative past simple sentence using 'did'. Another example:They did not eat their lunch. (Main verb is present, 'did' is past form of 'do'.)I do not know the answer to your question.This is a present simple negative sentence. The word 'did' is present. The main verb 'know' is present form.