Depending on the sentence, but since it falls on the comparative degree of adjective, you can say words like 'mas', 'higit', 'lalo'.
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"The more I eat, the more I get fat"
Habang lalo akong kumakain, lalo akong tumataba [nananaba].
Habang mas marami akong kinakain, mas tumataba ako.
"The more you smile, the more I am in love"
Habang lalo kang ngumingiti, labis mo akong napapaibig [lalo akong naiin-love].
"The more he insisted, the angrier she got"
Habang lalo nyang ipinagpipilitan, higit syang nagagalit.