Em inglês é muito comum um verbo mudar completamente seu significado com o aparecimento ou não de preposições junto dele. São os chamados phrasal verbs. Veja alguns exemplos:
SUCKTO SUCK: Chupar, sugar, mamar - "The baby sucked on the mother's breasts"
TO SUCK AT: Ser péssimo em alguma coisa. "I suck at swimming"
TO SUCK IN: Enganar, burlar, tirar vantagem. "She was sucked in by that guy"
TO SUCK UP TO: "Puxar o saco" de alguém. "He's totally sucking up to his boss!"
TO LOOK AT: Olhar (para) - "Look at the sky!"
TO LOOK FOR: Procurar (por) - "I was looking for my keys. Have you seen them?"
TO LOOK UP TO: Admirar, espelhar-se - "I've always looked up to my father"
TO LOOK: Parecer, Ter a aparência de - "She looks tired"
TO LOOK AFTER: Tomar conta de - "He looks after his little brother"
TO LOOK OUT: Tomar cuidado - "Look out! There's a hole on the floor"
TO GET: obter, conseguir - "I'm trying to get my driver's license"
TO GET DOWN: Abaixar-se - "Get down! He might see you!"
TO GET UP: Levantar-se (da cama) - "I get up at 6 a.m. every day"
TO GET IN: Entrar - "Hi teacher. Can I get in?"
TO GET OUT: Sair de um ambiente fechado. - "I need some air. I have to get out of here"
TO GET BACK: Retornar, voltar. "She got back home yesterday"
TO GET ALONG WITH: Se dar bem com alguém, ser simpático. "We've got along immediately"
TO BREAK - Quebrar - "She broke her arm"
TO BREAK UP - Terminar um relacionamento - "I'm going to break up with her"
TO BREAK IN - Interromper - "The TV station broke in to report the news of the president's death."
TO HANG - Pendurar - "She has to hang the picture on the wall"
TO HANG OUT - Andar com, passar um tempo com - "I usually hang out with my friends on weekends"
TO HANG UP - Desligar o telefone - "I need to hang up, I have to sleep!"
TO HANG ON - Esperar - "Can you hang on for a minute?"
TO RUN - Correr - "I love running in the morning."
TO RUN - Administrar um negócio - "She runs one restaurant and two snack bars"
TO RUN OUT OF - Ficar sem - "I'm running out of gas"
TO RUN OVER - Atropelar - "Unfortunately, she ran over the poor man"