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"That much" is an adverb which is often translated as "tanto", and "add" is a transitive verb which is often translated as "sumar". Learn more about the difference between "that much" and "add" below.
add(
ahd
)A transitive verb is a verb that requires a direct object (e.g., I bought a book.).
2. (to combine)
4. (to confer)
a. dar
Her articles add a light-hearted touch to the magazine.Sus artículos le dan un toque de humor a la revista.
An intransitive verb is one that does not require a direct object (e.g., The man sneezed.).
