Why can't sensory verbs be used in progressive tense?

Sensory verbs can't be used in the continuous tense, because it is a verb expressing state, belonging to a copula, and has no passivity. Such as: watching, listening, tasting, smelling, washing, standing, speaking, talking, etc.

Word parsing:

First of all, look

1, pronunciation: English? 【l? K] beautiful? 【l? k]?

2. Translation:

Verb (short for verb)? Look; Looking for; Appear to see; Gaze; face

Noun (short for noun)? Look; Appearance; situation

He looked at the baby with a smile.

He smiled at the baby.

Second, the sound.

1, pronunciation: English? 【sa? Nd] beautiful? 【sa? nd]?

2. Translation:

Noun (short for noun)? Sound; Noise; Music style; Melody; Impression; Feeling; Strait; Swim bladder; survey

Verb (short for verb)? Sound; Feeling; Make a sound; Pronunciation; Detection depth; Sound sb.' s opinion (about sth)

Adjective? Effective; Reasonable; Reliable; Comprehensive; Health; In good condition; Sleep soundly; strict

The man left, and his footsteps were silent.

The man left without making a sound.

Third, the taste.

1, pronunciation: English? 【te? St] beautiful? 【te? st]?

2. Translation:

Noun (short for noun)? Taste; Taste; Try it; Taste; avocation

Verb (short for verb)? Taste; Taste ...; experience

I caught a cold, so I lost my taste.

I have a cold and can't taste it.

Fourth, the smell.

1, pronunciation: English? Is it beautiful? [smel]?

2. Translation:

Noun (short for noun)? Smell; Sense of smell; smell

Verb (short for verb)? Smell; Smell; Give off a smell; Bad smell; know

The strong smell makes me vomit.

The strong smell made me vomit.

Verb (abbreviation for verb) washing

1, pronunciation: English? [w] beautiful? 【wɑ】?

2. Translation:

Noun (short for noun)? Wash; wash

Verb (short for verb)? Wash; Washing; clear

This material will shrink when washed.

This material will shrink after washing.