Не огорчу ! present simple, present continuous, future simple, past simple, present perfect сигналы к этим временам.

Present simple 
usually
always
seldom
often
never
somtimes 
every day/week/yaer
continuous
now
at the moment
look! listen!
perfect
just
allready
ever 
never 
yet
recently
lately
f.s.
next
tomorrow
soon

past simple
last
...ago
in 1999