It would seem that someone left the building unlocked.
WORD CHOICE: WORD CHOICE: seem, appear, look, soundSeem and appear have the same meaning but appear is more formal • They seem upset. • This appears to be a good solution. You use look to say how someone or something seems to you when you look at them • Maureen looked tired. • That book looks good. You use sound to say how someone or something seems to you when you hear or read about them, or hear them • She sounds a lovely person. • The party sounded great. • He sounded tired.GRAMMARSeem can be followed by an adjective or an adjective and noun • She seemed happy. • He seems a nice man.Seem can also be followed by a verb in the infinitive • His story seems to be true. • You seem to think it's my fault.!! Seem can be followed by as if or as though but not just by as • It seems a small thing (NOT it seems as a small thing), but it's very important. • It seemed as if he wanted us to leave (NOT it seemed as he wanted ...).