In the if-clauseA group of related words containing a subject and a verb. of the first conditional we can use should (to express that the condition is less likely), can (permission or ability), will or would (willingness, insistence and refusal), must (obligation) or may (permission).

Will can express insistence/willingness and won't refusal/unwillingness in the present.

To express past expectation and assumption, the same auxiliariesA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") are used in the case of present expectations and assumptions. However, the infinitives that follow are perfectThe aspect expressing completion. E.g.: He’s finished university. infinitives.

To express prediction, expectation and assumption, the following auxiliariesA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") are used.

For future ability, both the auxiliaryA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") can and the future forms of be able to are used.

If you ask him, he can probably help you. 
If you ask him, he will probably be able to help you.

Normally, the auxiliariesA helping verb used with main verbs to express mood, voice and tense. E.g.: I can't stand when I am disturbed. ("can", "am") of permission, possibility and willingness are used to express requests.

The future perfectThe aspect expressing completion. E.g.: He’s finished university. continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. is used for eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head.s which will have been in progressAn action is in progress when it is happening. E.g.: When I arrived he was surfing. ("he was surfing") at a definiteRelating to a specific or determined person, thing, idea or time. E.g.: I know the guy you are talking about. ("the guy you are talking about") point of timeA particular moment in time. E.g.: She came home at six. ("six") I was born in 1980. ("1980") in the future. It relates to the future perfect tense in the same way as the present perfect continuous relates to the present perfect, or the past perfect continuous to the past perfect (durationA concept, related to the continuous aspect, expressing that an action is in progress. E.g.: What are you doing? and result/completionA concept, related to the perfect aspect, expressing that an action has finished. E.g.: He’s finished university.).

The following sentences are not in future perfectThe aspect expressing completion. E.g.: He’s finished university., although they contain the same form. They express assumption about a past eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head..

You won't have heard the news that she's been accepted. (= I don't suppose you have heard the news.)
Ingrid joined our team last summer so many of you will have met her already.

The future perfectThe aspect expressing completion. E.g.: He’s finished university. tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. expresses that an eventA general term expressing that somebody or something does something or that something happens. E.g.: An apple fell on Isaac’s head. will be completeA concept, related to the perfect aspect, expressing that an action has finished. E.g.: He’s finished university.d before a point in the future. This event may happen at any time up to that point. It is normally used with time expressionA word or group of words used in a particular situation. E.g.: Good morning, at six, on the sofas and clauseA group of related words containing a subject and a verb.s beginning with by.

We can use the future continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. for fixed arrangements and plans in the same way as we use the present continuous, although in this case these may be less definiteRelating to a specific or determined person, thing, idea or time. E.g.: I know the guy you are talking about. ("the guy you are talking about") and formalNot belonging to colloquial or everyday speech; official. E.g.: I demand that Mr Smith call the person on whom the committee has decided..

The band will be performing live sometime in October.
We will be arriving in Szeged soon.