Question

Philipp and Johnny ............ a song.

• A. is singing
• B. are singing
• C. has singing
• D. were singing

Answer 1

Answer:

B. are singing

• "Are singing" is in the present continuous tense. Philipp and Johnny, are plural subjects.
•  "is" is singular, but since there are two subjects (Philipp and Johnny), the correct form should be the plural "are." 
• "Were singing" is in the past continuous tense.
• "has" is not typically used as an auxiliary verb with the present participle ("-ing" form) to create the present continuous tense.