Hogy helyes angolul: "Egy pár sétál az utcán? "

Én egyes számban használnám:

A couple is walking in the street.

De eszerint mindkettő használható:

When used to refer to two people who function socially as a unit, as in a married couple, the word couple may take either a singular or a plural verb, depending on whether the members are considered individually or collectively:

The couple were married last week.

Only one couple was left on the dance floor

És még egy nyelvtani magyarázat:

When you use "couple" the way you do above, the word is usually regarded as a collective noun, a singular entity, as in "That couple is cute," and it takes a singular verb. When it falls into the pattern of "a couple of [plural noun]," however, it will take a plural verb (at least in the U.S., this is true): "A couple of birds are building a nest in the garage."

Ennek alapján maradok az "is walking" megoldásnál.

:)

A family az alap szó erre az esetre, ami is-el és are-al is állhat, attól függően, hogy együtt vagy külön-külön.

De pl a police az meg mindig ARE.