1
Every evening I lie my baby in her cot.
Every evening I lay my baby in her cot.
Use lay + person/thing when you put someone or something down: ‘She laid the baby on the bed.’ Use lie when the person or thing is already in a flat position: ‘The baby is lying on the bed.’ Lie does not take a person or thing after it in this meaning.
2
I layed my jacket on the chair.
I laid my jacket on the chair.
The past form of lay is laid, not layed. The forms are lay–laid–laid. Be careful: lay is also the past form of lie meaning ‘be in a flat position’: ‘Yesterday I lay on the sofa.’
Check our grammar lesson on the difference between lay and lie.
See LIE