PRACTICE
Personal-Pronoun 'Tags' with Verb
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Personal-Pronoun 'Tags' without Verb
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Because these pronoun 'tags' cannot complete the verb, they are also used alone (i.e., outside the context of a sentence) as a short answer.
In this exchange, the first answer is using the verb, and the second is not.
- ¿ A quién invitamos ? (Whom are we inviting?)
- Lo invitamos a él.
- ¿ A quién ?
- A él.
Likewise, the personal pronoun "lo" couldn't be used as a one-word answer without the verb.