That is the way that (most varieties of) English function. The reasons are historical: an older -t ending changed to -s.
Furnishes is the third person singular present tense of furnish.
The present tense of the third person singular pronouns 'she' and 'he' takes the form 'he' as in "he runs" or "he eats."
He/She speaks (present tense) He/she spoke ( past tense) He/She will speak (future tense).
The present tense of "get" is "get" for the first person singular and plural (I, we) and "gets" for the third person singular (he, she, it).
Are is the present tense of "be" Present : am/is/are Past : was/were future: will be
Furnishes is the third person singular present tense of furnish.
The present tense of the third person singular pronouns 'she' and 'he' takes the form 'he' as in "he runs" or "he eats."
Flies is the present tense, third person singular conjugation of fly.
He/She speaks (present tense) He/she spoke ( past tense) He/She will speak (future tense).
The present tense of "get" is "get" for the first person singular and plural (I, we) and "gets" for the third person singular (he, she, it).
Are is the present tense of "be" Present : am/is/are Past : was/were future: will be
"has" for the third person singular and "have" for all other forms.
Yes, has is the present tense, third person singular conjugation of have.
I am You are She is We are They are
Relaxes is the third person singular form (present tense). Relax is the third person plural form (present tense).
The present tense third person singular is "removes". The present tense third person plural is "remove".
The third person singular of the verb "to know" in the present tense is "knows." For example, "He knows the answer."