• 一(one; initial)
• 尢(disabled person; insufficient)

From the beginning there was a shortage, so 無 means 'nothing at all'.

• 口(mouth; opening)
• 丁(man; adult male)

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 牛(cow; ox)
• 口(mouth; speech)

Use your mouth to declare something like a cow's loud moo that carries far, so everyone hears it.

• 一(one; initial)
• 尢(disabled person; insufficient)

From the beginning there was a shortage, so 無 means 'nothing at all'.

• 口(mouth; opening)
• 丁(man; adult male)

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 牛(cow; ox)
• 口(mouth; speech)

Use your mouth to declare something like a cow's loud moo that carries far, so everyone hears it.