Hi,<br/><br/>Although this "construct" can be found in many online dictionaries, there are nuances that I hope you could explain to me in more detail...<br/><br/>(1) to give/deliver a lecture <b>ON</b> math/physics/English history/modern Russian literature, etc.<br/><br/>All of these examples are perfect English, aren't they?<br/><br/>(2) What if I use <b>ABOUT</b> for <b>ON</b> in the same examples?<br/>Would they still remain good/natural English?<br/><br/>In other words, if you could clarify if (or when) the prepositions ON and ABOUT can be used 100% interchangeably in such/similar context?<br/><br/>(3) What preposition(s) can be used after "lecturer"? Is "IN" the only possible?<br/><i>John is a leacturer <b>IN</b> chemistry</i><br/><br/>(4) What prepositions would do in the following context?<br/><br/><i>Dr.Snow is a leacturer <b>???</b> (certain institution/university/etc.)</i><br/><br/></br>mus-te