Learn Spanish (Spain): Inflemos los globos y colguemos los banderines. - Let's inflate the balloons and hang the pennants.

To say "let's do something" in Spanish, we use the nosotros (we) form of the present subjunctive. For the -ar verbs inflar (to inflate) and colgar (to hang), the normal -amos ending becomes -emos to create this command.

Why is it spelled colguemos with a "u"?

The verb colgar ends in -gar. When the ending changes to an -e in the subjunctive, we have to insert a u (-guemos) to keep the hard "g" sound. Without it, "colgemos" would be pronounced with a soft "g" (like the "h" in English "hello").

Colgar is a stem-changing verb (o to ue). Why isn't it cuelguemos?

You are right that colgar changes its stem in forms like cuelgo (I hang). However, for -ar and -er verbs, the nosotros form never takes the stem change, even in the subjunctive. So the "o" remains an "o" in colguemos.

Could I say vamos a inflar instead of inflemos?

Yes! Using vamos a plus an infinitive (like vamos a inflar y colgar) is a very common, everyday way to say "let's do something" in Spain. The subjunctive forms used here (inflemos, colguemos) are slightly more formal or emphatic, but both are completely natural at this level.