<p>I have 4 questions:</p>
<p>1) How do you know if an "it" is ambiguous or not? To me, sometimes it seems logical in the place that it's at.</p>
<p>2) I'm having trouble in knowing when to use the perfect present tense (I think it's called), but the verbs with "have/has/had" in it.</p>
<p>3) What's the hardest test from the online course for writing?</p>
<p>4) Usually...is the last one usually not "no error?"</p>
<p>4) I doubt it...</p>
<p>4) No...</p>
<p>4) Yes. There are very few correct "No Error" answers.</p>
<p>what about the other 3?</p>
<p>1) If you know what "it" is and what it refers to, it is not ambiguous. If you're talking about 2+ things and you say it, you don't know what you're talking about... but then it would be changing tenses... idk... good question</p>
<p>2) What exactly are you having trouble with? The present perfect tense is have/has + a past participle (E.g, I have gone, she has gone, we have gone)</p>
<p>3) No idea.</p>
<p>4) The last blank on Identifying Sentence Error questions is no error.</p>
<p>1) How do you know if an "it" is ambiguous or not? To me, sometimes it seems logical in the place that it's at.</p>
<p>Well, check if the "it" refers to two things, or two nothing at all. If the "it" can refer to two subjects then its ambiguous. "It" should only refer to one thing. Oh and the subject should precede the "it".</p>
<p>2) I'm having trouble in knowing when to use the perfect present tense (I think it's called), but the verbs with "have/has/had" in it.</p>
<p>Dunno. I don't use tenses =)</p>
<p>3) What's the hardest test from the online course for writing?</p>
<p>Dunno. Never did the course.</p>
<p>4) Usually...is the last one usually not "no error?"</p>
<p>You mean the last question?</p>