<p>when recipes for iced tea appeared in a few late nineteenth century cookbooks,the drink did not become popular until the 1904 world's fair</p>
<p>why 'when' is wrong grammatically?? isnt it referring to the time that iced tea appeared?</p>
<p>“When” is used as part of an adverbial clause to convey some action happening at the same time.</p>
<p>In the above example, “did not become popular until” clearly occurs long after “iced tea appeared” mentioned in the adverbial clause.</p>
<p>A corrected sentence would say, “Although recipes for iced tea appeared in a few late nineteenth century cookbooks,the drink did not become popular until the 1904 world’s fair.”</p>
<p>Thx a lot!</p>