[ Future Perfect Continuous Tense ]
Your children … paintball in my back yard for more than two hours by the time you pick them up.
- will have been being playing
- will have been playing

Random Topics:
Indefinite and Intensive NounGrammar: Used to, Would, Be used to, Get used toDependent ClausesPersuasive TextRelative Clauses and UsagePresent / Future / Present Progressive / non Action Verbsduring, for, whilePresent Tense vs Past TenseDegree of ComparisonPrepositions of Time & PlaceOther quiz:
Articles and Quantifiers › ViewThey say that ______ Turkish language is particularly difficult for ______ Europeans.
A. _ / the
B. _ / _
C. the / _
D. the / the
Grammar › View
The students__________for the school bus are good ones.
A. waited
B. waiting
C. which is waiting
D. to wait