私はドイツ語を

I [verb] German

→ 私
phrase Rare #30,823
I [verb] German This is an incomplete phrase meaning “I … German.” 私は marks the topic (“I”), ドイツ語 means “German,” and を marks German as the object of the following verb, such as speak, understand, or read.
JA: 私はドイツ語を勉強しています。
EN: I am studying German.

私はドイツ語を全く理解できない

I don't understand German at all.

私はドイツ語を読める話すことはできない

I can read German, but I can't speak it.

彼は上手に日本語を話します私はドイツ語を話せません

He speaks Japanese well, but I can't speak German.

私はドイツ語を話せません

I can't speak German.

私はドイツ語を読めるけど話せない

I can read German, but I can't speak it.