If and only if used in the same way means the same thing, except that only if is more forceful, more compelling If and only if is the most obligatory of the three, in which the action has been distinguished and emphasised, if, and only if it's the most forceful of the three I can only do so much in this time Or i can do only so much in this time. Only but (also but only) Oxford english dictionary (login required) below are some only but examples from the corpus of contemporary american english
Swap in only or nothing but for only but to see Ultimately, there is only but one choice for you, no To consume the entire pint 2 the oxford english dictionary defines but only (which can also occur as only but) as meaning ‘ (a) only, merely (b) except only’, and comments that its use is now poetical. In only when , there is a sense of urgency, a slightly more 'involved' writing
When only after, only if, only in this way etc Are placed at the beginning of the sentence for rhetorical effect, the subject and auxiliary are inverted Only after lunch can you play. 1 there is no difference between just and only in the context of this sentence The problem with this sentence is that neither of the constructions not just airports or not only airports cannot be used as the subject of a sentence *not just airports are part of the target customer group.
‘only that’s she’s an expert in her line.’ [source I have searched the similar expression on the internet So it doesn’t seem to be less frequently used. You should put only before a verb phrase when either (a) the verb phrase is the focussed constituent of only, or (b) when the verb phrase contains another constituent that is the focus of only Words with a focus (e.g, only, even, too, also) can go either immediately before their focussed constituent, or before any constituent that contains it. He eats, if only to survive
Do these two have differences And is if only to the reduced form of if it were only to
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