Learn Hardcore Romanian: După ploaie, cerul este senin.

după is a preposition meaning after. It introduces the time expression după ploaie to convey “after it rained” (or “after rain” in a general sense). In Romanian, după takes the accusative, but since ploaie is a feminine noun without an article, its accusative form looks identical to the nominative.

Why isn’t there an article before ploaie? Why not după o ploaie or după ploaia?

When you say după ploaie without an article, you refer to rain as a general phenomenon (“after rain”).
• după o ploaie means “after a rain” (one unspecified shower),
• după ploaia means “after the (specific) rain.”
Here, the meaning is general, so no article is used.

Why is there a comma after după ploaie?

The comma marks a brief pause after the introductory adverbial phrase după ploaie. It separates that time phrase from the main clause cerul este senin. In short sentences it’s optional, but it improves clarity by signaling the break.

Why do we say cerul instead of cer?

Romanian shows definiteness by attaching a suffix to the noun.
• cer = “sky” (indefinite)
• cerul = “the sky” (definite)
Since we’re talking about the sky in a general, definite sense, we use the definite article -ul.

What role does este play? Can it be shortened?

este is the 3rd person singular present of a fi (to be). It links the subject cerul and the predicate adjective senin. In colloquial speech you often hear cerul e senin, but in standard or written Romanian este is preferred.

What exactly does senin mean? How is it different from însorit?

senin describes a sky that is clear and cloudless.
însorit means “sunny,” focusing on sunlight rather than the absence of clouds. A sky can be însorit (lit by the sun) yet still have some clouds; only a cer senin is completely free of clouds.

Why isn’t senin inflected (for example, senină)?

Adjectives agree with the noun’s gender and number. cerul is masculine singular, and the predicative adjective for masculine singular is senin. If you described a feminine noun, you’d use senină (e.g. o zi senină – “a clear day”).