If julio verne ubiera used units whether which title would have given his book 20000 leagues under the sea express using whole numbers using the unit of if more large
Se puede nadar en este lago.
It is an impersonal sentence because it has no subject. This case is used "<u>se</u>", it is when we want to talk about the subject.
<h3><em><u>MissSpanish</u></em></h3>
i believe it should be "add the new ending to the infinitive" and "don't drop the -ar, -er, and -ir"