Usage of 'Only'

This is a word that is a pitfall to the most of us whether learned or unlearned. Probably it is the most indiscriminately used word in the language. From the different positions it is made to occupy in a sentence it can relatively change the meaning. For instance in the sentence—"I only struck him that time," the meaning to be inferred is, that the only thing I did to him was to strike him, not kick or otherwise abuse him. But if the only is shifted, so as to make the sentence read-"I struck him only that time" the meaning conveyed is, that only on that occasion and at no other time did I strike him. If another shift is made to-"I struck only him that time," the meaning is again altered so that it signifies he was the only person I struck. 

In speaking we can by emphasis impress our meaning on our hearers, but in writing we have nothing to depend upon but the position of the word in the sentence. The best rule in regard to only is to place it immediately before the word or phrase it modifies or limits.