How many lines can pass through two given point ?

Draw a rough figure and label it suitably in the following case:

Point $P$ lies on $\overline{AB}$

Draw a rough figure and label it suitably in the following case:

$\overleftrightarrow{XY}$ and $\overleftrightarrow{PQ}$ intersect at $M$.

Draw a rough figure and label it suitably in the following case:

Line $l$ contains $E$ and $F$ but not $D$.

Draw a rough figure and label it suitably in the following case:

$\overleftrightarrow{OP}$ and $\overleftrightarrow{OQ}$ meet at $O$.

Consider the following figure of line $\overleftrightarrow{MN}$.

$Q, M, O, N, P$ are points on the line $\overleftrightarrow{MN}$

Consider the following figure of line $\overleftrightarrow{MN}$.

$M, O, N$ are points on a line segment $\overline{MN}$.

Consider the following figure of line $\overleftrightarrow{MN}$.

$M$ and $N$ are end points of line segment $\overline{MN}$.

Consider the following figure of line $\overleftrightarrow{MN}$.

$O$ and $N$ are the end points of the line segment $\overline{OP}$.