By Abbreviations, Present tenses

Hi,1. I have been to Bath several times and enjoy the hot springs there. The present tense tells me you stilll always enjoy them. 2. I have been to Bath several times and have enjoyed the hot springs there.3.I have been to Bath several times and enjoyed the hot springs there. If you said this to...

This is my version which agrees with your points, Kajjo. To (in order to) increase the octane number, the following lead compounds are added to the petrol for motor vehicle and airplane engines: tetraethyl lead (TEL) and tetramethyl lead (TML), in a solution of so called ethyl liquid (the...