
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
Given the parametric equation of line $l$ as $\begin{cases}x=a-2t \\ y=-4t\end{cases}$ (where $t$ is the parameter), and the parametric equation of circle $C$ as $\left\{\begin{matrix}x=4\cos \theta \\ y=4\sin \theta\end{matrix}\right.$ (where $\theta$ is the parameter),

(Ⅰ) Find the standard equations of line $l$ and circle $C$;

(Ⅱ) If line $l$ and circle $C$ have common points, find the range of the real number $a$.

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