This sentence is in past tense.
"Lay" is the past tense of "Lie" which is the present tense.
I have lain on bed for more than five hours
The past tense of "lay" is "laid." For example: "I laid the book on the table."
The present tense for "laid" is "lay." For example: "I lay the book on the table."
The past tense sentence with "keep" would be: She kept the book on the shelf.
"Lay" is the past tense of "Lie" which is the present tense.
I have lain on bed for more than five hours
The past tense of "lay" is "laid." For example: "I laid the book on the table."
Wooqoq
The subject is "book" or "a book"
The present tense for "laid" is "lay." For example: "I lay the book on the table."
The past tense sentence with "keep" would be: She kept the book on the shelf.
The present perfect tense of "lay" is "has/have laid." For example: "I have laid the book on the table."
'Laid' is a the past tense form of 'Lay' which is a past tense form of 'lie'.
I lie the book on the table. NOW I laid the book down when I finished with it. PAST Lie down now! When did you lie down yesterday? (The rule: Chickens lay eggs. Everything else lies. Laid is correct only when applied to past tense)
Read can be used in different ways for past tense and present tense. Present Tense: I think I am going to read this book someone suggested to me. Past Tense: I read that book when it came out around a year ago.
You read a book everyday. This sentence is the same in past tense or present tense, because the past form of read is spelt the same - read - but it is pronounced red. To make certain the reader understands it is a past sentence you could add a time phrase eg You read a book everyday last week.