
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
In the Cartesian coordinate system $xOy$, the parametric equation of line $l$ is $\begin{cases} x=- \dfrac { \sqrt {3}}{2}t \\ y=-5+ \dfrac {1}{2}t \end{cases}$ (where $t$ is the parameter). A polar coordinate system is established with the origin as the pole and the positive half-axis of $x$ as the polar axis. It is known that the polar equation of curve $C$ is $\rho=2 \sqrt {3}\cos \theta$.  
(Ⅰ) Convert the polar equation of curve $C$ into a Cartesian coordinate equation and explain what curve it represents;  
(Ⅱ) If $P$ is a point on line $l$, and $Q$ is a point on curve $C$, when $|PQ|$ takes the minimum value, find the Cartesian coordinates of $P$.

Present the answer in LaTex format: \boxed{Your answer}
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