The word "signalled" is the past tense and past participle of the verb "signal".
The etymology of "signal" can be traced back to the Latin word "signum", which means a sign or signal. This Latin word further derives from the Proto-Indo-European root "*sekw-", meaning "to follow" or "to mark".
Over the years, the word "signal" has evolved and been adapted into various languages, including Old French as "signel" and Middle English as "signale". Eventually, it took the form "signal" in modern English, with "signalled" being the past tense or past participle form of the verb.
CONDITIONAL
I
would signalled
you
would signalled
he/she/it
would signalled
we
would signalled
they
would signalled
I
would signal
we
would signal
you
would signal
he/she/it
would signal
they
would signal
CONDITIONAL CONTINUOUS
I
would be signalling
you
would be signalling
he/she/it
would be signalling
we
would be signalling
they
would be signalling
CONDITIONAL PERFECT
I
would have signalled
you
would have signalled
he/she/it
would have signalled
we
would have signalled
they
would have signalled
CONDITIONAL PERFECT CONTINUOUS
I
would have been signalling
you
would have been signalling
he/she/it
would have been signalling
we
would have been signalling
they
would have been signalling
FUTURE
I
will signal
you
will signal
he/she/it
will signal
we
will signal
they
will signal
FUTURE CONTINUOUS
I
will be signalling
you
will be signalling
he/she/it
will be signalling
we
will be signalling
they
will be signalling
FUTURE PERFECT
I
will have signalled
you
will have signalled
he/she/it
will have signalled
we
will have signalled
they
will have signalled
I
will have signalled, will have signaled
we
will have signalled, will have signaled
you
will have signalled, will have signaled
he/she/it
will have signalled, will have signaled
they
will have signalled, will have signaled
FUTURE PERFECT CONTINUOUS
I
will have been signalling
you
will have been signalling
he/she/it
will have been signalling
we
will have been signalling
they
will have been signalling
IMPERATIVE
you
signal
we
let´s signal
to signal
PAST
I
signalled
you
signalled
he/she/it
signalled
we
signalled
they
signalled
I
signalled, signaled
we
signalled, signaled
you
signalled, signaled
he/she/it
signalled, signaled
they
signalled, signaled
PAST CONTINUOUS
I
was signalling
you
were signalling
he/she/it
was signalling
we
were signalling
they
were signalling
PAST PARTICIPLE
signalled
PAST PERFECT
I
had signalled
you
had signalled
he/she/it
had signalled
we
had signalled
they
had signalled
I
had signalled, had signaled
we
had signalled, had signaled
you
had signalled, had signaled
he/she/it
had signalled, had signaled
they
had signalled, had signaled
PAST PERFECT CONTINUOUS
I
had been signalling
you
had been signalling
he/she/it
had been signalling
we
had been signalling
they
had been signalling
PRESENT
I
signal
you
signal
he/she/it
signals
we
signal
they
signal
PRESENT CONTINUOUS
I
am signalling
you
are signalling
he/she/it
is signalling
we
are signalling
they
are signalling
PRESENT PARTICIPLE
signalling
PRESENT PERFECT
I
have signalled
you
have signalled
he/she/it
has signalled
we
have signalled
they
have signalled
I
have signaled, have signalled
we
have signaled, have signalled
you
have signaled, have signalled
he/she/it
has signaled, has signalled
they
have signaled, have signalled
PRESENT PERFECT CONTINUOUS
I
have been signalling
you
have been signalling
he/she/it
has been signalling
we
have been signalling
they
have been signalling
I
am signaling, am signalling
we
are signalling, are signaling
you
are signalling, are signaling
he/she/it
is signaling, is signalling
they
are signalling, are signaling
I
was signalling, was signaling
we
were signaling, were signalling
you
were signaling, were signalling
he/she/it
was signalling, was signaling
they
were signaling, were signalling
I
will be signaling, will be signalling
we
will be signaling, will be signalling
you
will be signaling, will be signalling
he/she/it
will be signaling, will be signalling
they
will be signaling, will be signalling
I
have been signaling, have been signalling
we
have been signaling, have been signalling
you
have been signalling, have been signaling
he/she/it
has been signaling, has been signalling
they
have been signalling, have been signaling
I
had been signalling, had been signaling
we
had been signalling, had been signaling
you
had been signalling, had been signaling
he/she/it
had been signalling, had been signaling
they
had been signalling, had been signaling
I
will have been signaling, will have been signalling
we
will have been signaling, will have been signalling
you
will have been signaling, will have been signalling
he/she/it
will have been signaling, will have been signalling
they
will have been signaling, will have been signalling
I
would have signalled, would have signaled
we
would have signalled, would have signaled
you
would have signalled, would have signaled
he/she/it
would have signalled, would have signaled
they
would have signalled, would have signaled
I
would be signalling, would be signaling
we
would be signalling, would be signaling
you
would be signalling, would be signaling
he/she/it
would be signalling, would be signaling
they
would be signalling, would be signaling
I
would have been signalling, would have been signaling
we
would have been signalling, would have been signaling
you
would have been signalling, would have been signaling
he/she/it
would have been signalling, would have been signaling
they
would have been signalling, would have been signaling