<p>Is 'while at the same time' redundant?</p>
<p>Yes. “While” will suffice.</p>
<p>Another question:
Sentence: For building vocabulary skills, students should try to speak, rather than memorizing.</p>
<p>Why is ‘for building’ inappropriate?</p>
<p>Is 'while at the same time' redundant?</p>
<p>Yes. “While” will suffice.</p>
<p>Another question:
Sentence: For building vocabulary skills, students should try to speak, rather than memorizing.</p>
<p>Why is ‘for building’ inappropriate?</p>