Mas: (borrowed from Spanish más) It means "more" in Tagalog Usually used with an adjective (pang-uri) Halimbawa | Example: Mas mahirap mag-aral ng Tagalog. | It's more difficult to study Tagalog. The adjective in this example is "mahirap" which means "difficult" "Mas" can indicate comparisons for adjectives: Malaki - Big Mas malaki - Bigger Pinakamalaki - Biggest Lalo: Shows effect of adding or being more than what it is before. Can be used with a verb (pandiwa) Halimbawa | Example: Lalong gumanda ang kanta nang lapatan niya ng musika. | The song became more beautiful when he/she accompanied it with music. Verb (pandiwa) in this example is "ganda" act or state of being beautiful (OR to become beautiful). Past tense: "gumanda" which means "became beautiful" Halimbawa | Example: Lalong umiyak ang bata nang umalis ang kanyang ina. | The child cried more (OR cried a lot) when his/her mother left. Verb: Iyak - To cry (Past tense: Umiyak) Can be used with a subject: Lalo akong tumaba nang kumain ako ng madami. | I got fatter when I ate more. Subject: "Ako" which means "I" I hope my answer help you. Your question is a bit hard because the two has almost similar meaning. I just based my answer on how I will use it or how I usually hear it being used. Thanks! Wew! If you have more questions, I'd be happy to help. :)