# He is speaking slowly. 他正慢慢地說(著)。 ←1.“speaking”是不及物動詞(另例也可當及物動詞)。2.這句話是現在進行式。
# Mom is mopping the floor busily. 媽媽正忙著拖地。 ← 1.“mopping ”the floor是及物動詞(另例也可當不及物動詞)。2.“is mopping”是現在進行式。
(1)+(2) The actions of speaking,mopping in examples are in progress now:-speaking--intransitive; while mopping--transitive. Note the use of "speaking" and "mopping" are in the present continuous tense-in progress.