ist or sind, hat or haben — working from home.
Type the verb in the right form — the grey word is its infinitive. Find the subject first: is it one thing or more than one?
The subject comes first — but what comes after it (mit …, für …, in …) is not the subject.
After dass, weil, wenn, ob, obwohl the verb goes to the end, a long way from its subject. 'Ein Vorteil ist' is singular — the dass-clause has a subject of its own.
die Meinung vieler Eltern, einer der Gründe, die Zahl der Autos: the first noun is the subject, the Genitiv after it isn't. A relative clause in between doesn't change it either.
Some lines have two verbs, each with its own subject.