the form of “a” used before a word that begins with a vowel sound
From this reading There is an old saying that “opportunity knocks but once” upon our door.
used with a past participle to form the passive, or with -ing for continuous tenses
From this reading The important thing is to be ready for them when they come.
used to introduce something that contrasts with what came before
From this reading There is an old saying that “opportunity knocks but once” upon our door.
definitely or positively (“sure” is sometimes used informally for “surely”)
From this reading Opportunities will certainly continue to come to us.
move toward, travel toward something or somebody or approach something or somebody
From this reading Opportunities will certainly continue to come to us.
continue a certain state, condition, or activity
From this reading Opportunities will certainly continue to come to us.
a swinging or sliding barrier that will close the entrance to a room or building or vehicle
From this reading There is an old saying that “opportunity knocks but once” upon our door.
intended to be given to, or used by, somebody
From this reading The important thing is to be ready for them when they come.
highest in quality
From this reading We never know what incident may turn out to be our greatest opportunity.
of great significance or value
From this reading The important thing is to be ready for them when they come.
a single distinct event
From this reading We never know what incident may turn out to be our greatest opportunity.
the form of “be” used with he, she, it, or a singular noun
From this reading There is an old saying that “opportunity knocks but once” upon our door.
knocksnounUS /nɑːks/
plural of “knock” — the sound of knocking (as on a door or in an engine or bearing)
From this reading There is an old saying that “opportunity knocks but once” upon our door.
be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
From this reading We never know what incident may turn out to be our greatest opportunity.
used to say something is possible, or to give permission
From this reading We never know what incident may turn out to be our greatest opportunity.
not ever; at no time in the past or future
From this reading We never know what incident may turn out to be our greatest opportunity.
used to make a word, phrase, or sentence negative
From this reading This is not true.
(used especially of persons) having lived for a relatively long time or attained a specific age
From this reading There is an old saying that “opportunity knocks but once” upon our door.
on one occasion
From this reading There is an old saying that “opportunity knocks but once” upon our door.
OpportunitiesnounUS /ˌɑːpərˈtuːnətiz/
plural of “opportunity” — a possibility due to a favorable combination of circumstances
From this reading Opportunities will certainly continue to come to us.
a possibility due to a favorable combination of circumstances
From this reading There is an old saying that “opportunity knocks but once” upon our door.
belonging to the speaker and others
From this reading There is an old saying that “opportunity knocks but once” upon our door.
not allowed to continue to bat or run
From this reading We never know what incident may turn out to be our greatest opportunity.
completely prepared or in condition for immediate action or use or progress
From this reading The important thing is to be ready for them when they come.
a word or phrase that particular people use in particular situations
From this reading There is an old saying that “opportunity knocks but once” upon our door.
used to introduce what somebody said, thought, or felt
From this reading There is an old saying that “opportunity knocks but once” upon our door.
used before a noun that is already known, already mentioned, or the only one of its kind
From this reading The important thing is to be ready for them when they come.
the people or things already mentioned, as the object
From this reading The important thing is to be ready for them when they come.
in or at that place or location
From this reading There is an old saying that “opportunity knocks but once” upon our door.
the people, animals, or things already mentioned, as the subject
From this reading The important thing is to be ready for them when they come.
a special situation
From this reading The important thing is to be ready for them when they come.
used for a person or thing that is near, or that has just been mentioned
From this reading This is not true.
used before the base form of a verb to make the infinitive
From this reading Opportunities will certainly continue to come to us.
consistent with fact or reality; not false
From this reading This is not true.
change orientation or direction, also in the abstract sense
From this reading We never know what incident may turn out to be our greatest opportunity.
uponprepositionUS /əˈpɑːn/
a formal word for “on”
From this reading There is an old saying that “opportunity knocks but once” upon our door.
the speaker and others, as the object of a verb or preposition
From this reading Opportunities will certainly continue to come to us.
the speaker together with one or more other people
From this reading We never know what incident may turn out to be our greatest opportunity.
used to ask for information about something
From this reading We never know what incident may turn out to be our greatest opportunity.
at the time that
From this reading The important thing is to be ready for them when they come.
used to talk about the future, or about willingness
From this reading Opportunities will certainly continue to come to us.