Use everyday warning phrases like “If you do that again”. Practise conditionals, time linkers, and polite consequences so your meaning is clear and natural.
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Again, any of these Answers would do fine; but No.2 is probably the simplest and clearest.
Note that in No.3, there is a 'Future Perfect' : ' ... you will have reached ... ' (i.e. you haven't reached it yet, but by then, you will have'). |
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The short, colloquial form does this communicative job just as well as any of the others.
Once more, any of them would be satisfactory, but Answer 2 is perhaps the most formal and emphatic. In any case, there is the 'if'-clause first, in case any one else had other ideas that might stop the speaker going. Note that although we can use a Present form to express future action, we do not use the Simple Present ('I go ...'). |
We use the present form for a future action in such a situation as this. Answer 3 (with the implied Future Perfect : 'they [will] have gone') is possible but rather pedantic, though many other languages might insist on a more detailed structure like this.
Answer 4, while clear enough in what it means to say, is not correct English. |
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All four Answers are possible here; No.3 is the best and most elegant, because it is grammatically clear but also avoids having two 'ing's (see No.4, which is 'a bit of a mouthful' as we sometimes say!).
We use the Answer-1 version as 'spoken shorthand' for the Future; at least it has a Continuous element to its structure. |
Answer 1 is clear enough, but almost too simple and not what we'd say;
Answer 2 is possible, but the usual phrases also contain the word 'get', which this version doesn't; Answer 4 is clear again but probably has slightly more words in it than it needs. Again we have an example of the Present Continuous / Progressive verb denoting a single future event, which may seem a bit strange but is a widespread usage in modern spoken English. |
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('When it does ... you will ...') : a future condition is expressed using a present verb.
Somehow this is a bit like the earlier days of computer-programming, using an English-based coding language called BASIC, where conditional instructions were given in such terms as : 'IF x = 2 THEN PRINT 'YES!' ' ('X' may not have happened to be equal to 2 when the program was written; but as and when it ever did have that value ~ at some point then in the future ~ the computer would have done what it had been told!) |
The 'if'-clause takes a Present verb, so Answers 3 and 4 are no good.
Answer 2 uses the (sightly) emphatic form, as though to express some doubt whether the train will be punctual. ('It would be good if it were!') Answer 1 uses a very old-fashioned, poetic tense sequence, which also suggests that a timely arrival is very unlikely. It is in correct English, but not an appropriate way to express the situation in this context. |
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Only Answer 3 is good and clear here.
Answer 2 is just about possible, in the sense that 'Because you are continuously making this difficult, I shall be looking somewhere else.' But this places two different senses on the Continuous verb forms (which look/sound as though they are meant to be understood in parallel), so there is some 'internal structural interference' between them, and the overall effect is not strengthened after all. |
The Present verb represents the future here, again.
The operatic reference is almost certainly to Verdi's 'La Traviata'. |
You may have noticed that the finished sentence remains ambiguous: what's going to fall, the gate or the child? (Or just possibly, both!)