is lying
Tom está mintiendo.
Tom is lying.
No puedo evitar sospechar que está mintiendo.
I can't help suspecting that he's lying.
Mary le está mintiendo a su padre.
Mary is lying to her father.
Tom te está mintiendo.
Tom is lying to you.
Yo sé cuándo alguien me está mintiendo.
I know when someone is lying to me.
Creo que Tom está mintiendo.
I think Tom is lying.