intindi
to understand

from the Spanish word entiende, meaning 'understands'

Mahirap bang intindihin?
Is it hard to understand?

Naiintindihan mo ba?
Do you understand (it)?

Naiintindihan mo ba ako?
Do you understand me? (use with people your own age or younger)

Naiintindihan po ba ninyo ako?
Do you understand me? (use with older people)

Naiintindihan kita.
I understand you. (casual)

Naiintindihan ko po kayo.
I understand you. (to older people)

Hindi ko naiintindihan.
I don't understand.

Hindi ko maintindihan.
I can't understand.

Hindi ko naiintindihan ang sinasabi mo.
I don't understand what you're saying.

Nagkakaintindihan ba tayo?
Do we understand each other?

Sana maintindihan mo...
I hope you understand...

A native Tagalog word for 'understand' is unawa.