The structure of the phrase will be in this form:
[object] を [action]
= [object] o [action]
= [action] [object]
For example:
eat apple = ringo o tabemasu = りんごを食べます
Hence,
I eat an apple. = watashi wa hitotsu ringo o tabemasu. = 私は一つりんごを食べます。
Other examples:
- The cat is drinking milk. = neko wa gyunyuu o nonde imasu. = 猫は牛乳を飲んでいます。(gyunyuu = milk)
- Who is studying Japanese? = dare ga nihongo o benkyou shiteimasu ka. = 誰が日本語を勉強していますか。(benkyou = study)