Did you receive my letter?
Tegami wa todokimashita ka.
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
to reach; to arrive; to get through; to get at; to be attentive; to pay attention; to be delivered; to carry (e.g. sound)
indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way