be alone in (doing) something phrase
be employed (in) doing something phrase
join someone in (doing) something phrase
lose no time in doing something phrase
be in the act of doing something phrase
be in the business of doing something phrase
take (a) delight in (doing) something phrase
there’s no harm in (doing) something phrase
in the middle of (doing) something phrase
take/find pleasure in (doing) something phrase
in the process of doing something phrase
there’s no use (in) doing something phrase
waste no time (in) doing something phrase
catch someone in the act (of doing something) phrase
there is no percentage in (doing) something phrase
not make a habit of doing something/not be in the habit of doing something phrase