"Signal" is the verb.
Simple past tense. (assuming you are talking in the afternoon/evening etc)
signal
Yes, convey is a verb.
The plural form of the word signal is signals.
The verb of complaint is complain. As in "to complain to someone".
subject = soft voices and the patter of little feet verb = signal
Signal is a noun (a signal) and a verb (to signal).
approach
Approaching can be an adjective, an adverb and a verb. Adjective: Something that approaches. Adverb: Used in the context of meaning 'nearly'. Verb: The present participle of the verb 'approach'.
Nope. its an action verb.
No. Approach is an action verb. Approached is the past tense of approach. It might also rarely be used as an adjective.
It can be used as a verb meaning 'to approach'.
Used as a verb, meaning to come near to or approach
Approach is a verb, when used in the usual sense, showing action. It can also be a noun, as in "a runway approach."
wave, jump, signal
Amplify is a verb. This device amplifies the signal from the microphone so that it can be heard.
"Stalled" is not always a verb, but it can be one. Example: "Fred stalled his car at the traffic signal".